Tools directory

231 tools from the syllabus. 209 have a free or open-source option. Each one links to the lessons that use it. Prices change, so check the tool's own site before you pay.

Find CostAll toolsFreeFree tierOpen sourcePaid

231 tools

• Gemini

  Free tier

  77 lessons: Reasoning Models: What "Thinking" Really Means · Fact-Check and Bias-Check Any AI Answer · What Happens to Your Data in AI Chats · 20 Everyday Work Tasks AI Can Do Today, and How to Measure the Gain and 73 more

• ChatGPT

  Free tier

  61 lessons: How LLMs Write: Next-Token Prediction, Temperature, Sampling · Reasoning Models: What "Thinking" Really Means · What Happens to Your Data in AI Chats · 20 Everyday Work Tasks AI Can Do Today, and How to Measure the Gain and 57 more

• Google Sheets

  Free

  free / self-host (compute costs apply)

  45 lessons: AI in Excel and Google Sheets · Analyse Real Spreadsheets With ChatGPT and Claude · Reusable Prompt Templates and Variables · Test Prompts Like Code and 41 more

• Claude

  Free tier

  34 lessons: Reasoning Models: What "Thinking" Really Means · What Happens to Your Data in AI Chats · 20 Everyday Work Tasks AI Can Do Today, and How to Measure the Gain · What Not to Paste Into AI: A Privacy Checklist and 30 more

• Google Colab

  Free tier

  29 lessons: Colab Basics: Notebooks, Runtimes, Files, Sharing · Python and Data in Colab: Sheets, Drive, Charts · Gemini Inside Colab: Generate, Explain, Fix Code · Colab GPUs: T4, L4, A100 and What Costs Units and 25 more

• NotebookLM

  Free tier

  26 lessons: NotebookLM Guide: Study Systems, Work Knowledge Bases, Audio Overviews · Cited Research Report Workflow · Turn Documents Into a Podcast Episode · No-Code RAG: NotebookLM, Dify, Flowise and 22 more

• Python

  Open sourceFree

  free / self-host (compute costs apply)

  25 lessons: Why Python for AI, and What You Need · Install Python and VS Code (Windows, Mac, Linux) · Variables, Strings, Lists and Dictionaries · If, Loops and Conditions and 21 more

• LangGraph

  Open sourceFree

  free / self-host (compute costs apply)

  24 lessons: Agentic RAG · Corrective RAG (CRAG) · Self-RAG · Adaptive RAG: Route by Question Type and 20 more

• DeepEval

  Open sourceFree tier

  20 lessons: Evaluate RAG With DeepEval · Component RAG Evals: Retriever, Reranker, Generator · Evaluate Agents: Trajectories and Tool Use · LLM-as-Judge, Done Right and 16 more

• Ollama

  Open sourceFree

  free / self-host (compute costs apply)

  19 lessons: Claude Code Free With Ollama: Full Setup · Build a Chat-With-Your-Database Agent · Run AI Locally With Ollama (and LM Studio) · Project: Document Summariser and 15 more

• OpenAI API

  Paid

  17 lessons: System Prompts That Hold, and Resisting Prompt Injection · Context Engineering: What Goes in the Window · Text-to-SQL: Ask Your Database in Plain English · OpenAI API From Zero and 13 more

• Gemini API

  Free tier

  15 lessons: Project: Sales Insights Assistant · Gemini API From Zero (Free Tier) · Provider Shoot-Out on Your Own Task · Tool Calling in Code and 11 more

• Langfuse

  Open sourceFree tier

  14 lessons: Monitor and Trace RAG in Production (Phoenix, TruLens, Langfuse) · Cost and Latency Budgets for Agents · Langfuse and LangSmith Tutorial · Dashboards and Alerts for AI Apps and 10 more

• LlamaIndex

  Open sourceFree

  free / self-host (compute costs apply)

  14 lessons: Loading PDFs, Docs and Web Pages · Metadata, Filters and Self-Querying · Semantic and Advanced Chunking: Parent-Document, Contextual, Late · Query Rewriting and Diversity: Multi-Query, HyDE, MMR and 10 more

• Model Context Protocol (MCP) SDKs

  Open sourceFree

  free / self-host (compute costs apply)

  14 lessons: MCP Explained · How MCP Really Works, Before You Code · Your First MCP Server in 10 Minutes · Give Your AI a Notes App (MCP) and 10 more

• n8n

  Open sourceFree tier

  14 lessons: n8n for Beginners · n8n vs Make vs Zapier vs Power Automate · Self-Host and Harden n8n: Docker, Errors, Retries, Monitoring · Your First AI Agent in n8n and 10 more

• Perplexity

  Free tier

  13 lessons: Fact-Check and Bias-Check Any AI Answer · Free vs Paid AI Plans: What You Really Get · Deep Research Modes Compared · Perplexity Guide, and How It Compares to ChatGPT Search and Google AI Mode and 9 more

• LangChain

  Open sourceFree

  free / self-host (compute costs apply)

  11 lessons: Build a Chat-With-Your-Database Agent · Loading PDFs, Docs and Web Pages · Chunking Basics: Fixed, Recursive and Structure-Aware · Semantic and Advanced Chunking: Parent-Document, Contextual, Late and 7 more

• Anthropic API

  Paid

  10 lessons: Anthropic Claude API From Zero · Provider Shoot-Out on Your Own Task · Messages, Roles and Multi-Turn Chat · Streaming Responses and a ChatGPT-Style UI and 6 more

• Chatterbox TTS

  Open sourceFree

  free / self-host (compute costs apply)

  10 lessons: Build a Faceless Explainer Pipeline · AI Voice and Transcription Tools: Free vs Paid · Text-to-Speech for Agents · How Modern TTS Works, and Licences and 6 more

• Chroma

  Open sourceFree

  free / self-host (compute costs apply)

  10 lessons: RAG Tutorial for Beginners: Free Python Chatbot · Chroma Tutorial · Choose a Vector DB (incl. LanceDB, Redis, Atlas): Benchmark on Your Data · Dense Retrieval and 6 more

• Docker

  Free tier

  10 lessons: WSL and Docker Basics for AI Developers · Computer-Use APIs · Sandboxing Agents: Containers, Files, Network, Secrets · Project: Build a Mini Coding-Agent Harness and 6 more

• Claude Code

  Paid

  9 lessons: AI Coding Tools Explained: Copilot, Cursor, Claude Code, Codex · Claude Code Free With Ollama: Full Setup · Coding Assistants Compared on One Real Project · Coding Agents Explained: Claude Code, Codex, Copilot Agent and 5 more

• promptfoo

  Open sourceFree

  free / self-host (compute costs apply)

  9 lessons: Test Prompts Like Code · Eval-Driven Development: Write the Test Before the Prompt · Safety Evals: Jailbreaks, Refusals and Over-Refusal · Flaky Evals in CI: Repeats, Thresholds, Baselines and 5 more

• FastAPI

  Open sourceFree

  free / self-host (compute costs apply)

  8 lessons: Build an API With FastAPI · Streaming Responses and a ChatGPT-Style UI · Next.js Front End for Your LLM Backend · Project: Ship a Public AI Study Helper and 4 more

• Hugging Face TRL

  Open sourceFree

  free / self-host (compute costs apply)

  8 lessons: LoRA Explained and Applied · Your First Fine-Tune on Colab (Instruction Tuning) · DPO Hands-On (and ORPO, KTO, Reward Models) · GRPO and RL for Reasoning and 4 more

• PyTorch

  Open sourceFree

  free / self-host (compute costs apply)

  8 lessons: Build and Train a Toy GPT · Train a Small Language Model on Colab · Optimisers: SGD, Adam, Learning-Rate Schedules · PyTorch Basics and 4 more

• Qdrant

  Open sourceFree tier

  8 lessons: Qdrant Tutorial · Choose a Vector DB (incl. LanceDB, Redis, Atlas): Benchmark on Your Data · Hybrid Search · Scaling RAG: Fresh Indexes, Latency, Cost, Millions of Docs and 4 more

• RAGAS

  Open sourceFree

  free / self-host (compute costs apply)

  8 lessons: RAGAS Tutorial, With a Synthetic Test Set · Component RAG Evals: Retriever, Reranker, Generator · Capstone: Company Docs Support Bot · Metrics for LLM Apps: From Code Checks to Rubrics and 4 more

• Canva AI

  Free tier

  7 lessons: Free AI Image Generators Compared, Plus Editing (Is Midjourney Worth It?) · Make a Consistent Brand Image Set · AI for Marketing and Sales · Lesson Plans and Worksheets in Minutes With AI and 3 more

• Claude Agent SDK

  Open source

  free / self-host (compute costs apply)

  7 lessons: Safety, Evals, and Rebuilding With an SDK · Claude Agent SDK · Skills and Plugins: Package Know-How for Agents · Hooks: Run Your Own Code Before and After Every Tool Call and 3 more

• GitHub Copilot

  Free tier

  7 lessons: AI Coding Tools Explained: Copilot, Cursor, Claude Code, Codex · Coding Assistants Compared on One Real Project · Coding Agents Explained: Claude Code, Codex, Copilot Agent · AI for Software Developers and 3 more

• Hugging Face Datasets

  Open sourceFree

  free / self-host (compute costs apply)

  7 lessons: Build an Eval Dataset (and Compare Prompts With promptfoo) · Golden Datasets and Test Sets That Last · Chat and Instruction Data Formats · Build a 300-1,000 Example Dataset: Clean, Split, Licence-Check and 3 more

• Microsoft Copilot

  Free tier

  7 lessons: 20 Everyday Work Tasks AI Can Do Today, and How to Measure the Gain · Microsoft Copilot Guide: Free and Microsoft 365 · ChatGPT vs Claude vs Gemini vs Copilot (+ Meta AI, Grok, DeepSeek): Same 5 Tasks · Free vs Paid AI Plans: What You Really Get and 3 more

• Unsloth

  Open sourceFree

  free / self-host (compute costs apply)

  7 lessons: Your First Fine-Tune on Colab (Instruction Tuning) · Make It Better: Data, Hyperparameters, Continued Pre-training, Multi-GPU · GRPO and RL for Reasoning · Unsloth (and LLaMA-Factory) and 3 more

• Whisper

  Open sourceFree

  free / self-host (compute costs apply)

  7 lessons: Run Open AI Models on Colab Without Breaking It · Speech-to-Text: Whisper, Deepgram, AssemblyAI · Build a Voice Dataset · Make It Sound Pro and 3 more

• Inspect (UK AI Security Institute)

  Open sourceFree

  free / self-host (compute costs apply)

  6 lessons: Evaluate a Harness: Same Model, Different Harness · Safety Evals: Jailbreaks, Refusals and Over-Refusal · Agent Task-Success Evals: End-State Checks and pass^k · Benchmarks and Their Limits: Contamination, Saturation and 2 more

• LiteLLM

  Open sourceFree

  free / self-host (compute costs apply)

  6 lessons: Measure and Cut Cost and Latency · Rate Limits, Fallbacks and Portable Code: LiteLLM, OpenRouter · Project: Cheap-First Model Router · Cost and Latency Budgets for Agents and 2 more

• MCP Inspector

  Open sourceFree

  free / self-host (compute costs apply)

  6 lessons: How MCP Really Works, Before You Code · Your First MCP Server in 10 Minutes · Test, Debug, Share and Deploy Your MCP Server (Remote + Clients) · Tool-Call and MCP Contract Tests and 2 more

• NumPy

  Open sourceFree

  free / self-host (compute costs apply)

  6 lessons: Vectors, Similarity and Probability, Visually · Matrices: What a Layer Really Does · Gradients, Loss Functions and Gradient Descent · From One Neuron to a Network and 2 more

• OpenAI Agents SDK

  Open source

  free / self-host (compute costs apply)

  6 lessons: OpenAI Agents SDK · Same Agent, Four Frameworks (+ TypeScript: Mastra, Vercel AI SDK) · Swarm and Handoffs · Project: Deep Research Agent Team and 2 more

• OpenAI Codex

  Paid

  6 lessons: AI Coding Tools Explained: Copilot, Cursor, Claude Code, Codex · Coding Assistants Compared on One Real Project · Coding Agents Explained: Claude Code, Codex, Copilot Agent · Working With Coding Agents: Rules, Plans, Tests, CI and 2 more

• pandas

  Open sourceFree

  free / self-host (compute costs apply)

  6 lessons: Python and Data in Colab: Sheets, Drive, Charts · pandas Basics for AI Work · pandas With an AI Assistant: Ask, Check, Run · AI-Built Dashboards in Streamlit and Looker Studio and 2 more

• Zapier

  Free tier

  6 lessons: Zapier AI Tutorial · n8n vs Make vs Zapier vs Power Automate · Project: Automated Weekly Report · Project: Automate 5 Hours a Week of Your Job and 2 more

• Arize Phoenix

  Open sourceFree

  free / self-host (compute costs apply)

  5 lessons: Monitor and Trace RAG in Production (Phoenix, TruLens, Langfuse) · Calibrate Your LLM Judge: Human Agreement and Bias · Online Evals and A/B Tests on Live Traffic · Arize Phoenix Evals: Trace First, Then Evaluate and 1 more

• Custom GPTs / Gems / Claude Projects

  Free tier

  5 lessons: Projects, Memory, Custom GPTs, Gems and Claude Projects · Build Your Team Prompt Library · Custom GPTs, Gems and Claude Projects as Simple Agents · Keep Your Brand Voice With a Custom Assistant and 1 more

• GitHub Actions

  Free tier

  5 lessons: Production Narration Pipeline · Regression Gates in CI · CI/CD for AI Apps · Flaky Evals in CI: Repeats, Thresholds, Baselines and 1 more

• Hugging Face Transformers

  Open sourceFree

  free / self-host (compute costs apply)

  5 lessons: Run Open AI Models on Colab Without Breaking It · Hugging Face for Beginners: Hub, Pipelines, Inference Providers · Hugging Face Transformers for Training · Fine-Tune Whisper for Indian Accents and 1 more

• OpenTelemetry (GenAI conventions)

  Open sourceFree

  free / self-host (compute costs apply)

  5 lessons: Tracing LLM Apps With OpenTelemetry · Dashboards and Alerts for AI Apps · Online Evals and A/B Tests on Live Traffic · Arize Phoenix Evals: Trace First, Then Evaluate and 1 more

• Qwen-VL

  Open source

  free / self-host (compute costs apply)

  5 lessons: Multimodal RAG: Images, Tables and Slides · Document AI: OCR, Forms and Tables · Open Vision-Language Models Locally · Project: Receipt and ID Checker and 1 more

• vLLM

  Open sourceFree

  free / self-host (compute costs apply)

  5 lessons: Serve Models at Scale: vLLM (and SGLang, TGI) · Self-Host an Open Model on a GPU Cloud (and When Kubernetes Helps) · Inference Optimisation: KV Cache and Prefix Caching · Speculative Decoding and Continuous Batching and 1 more

• CapCut

  Free tier

  4 lessons: AI Video Editing: CapCut and Descript · Build a Faceless Explainer Pipeline · Project: Repurpose One Video Into 10 Posts · Scripts, Titles, Thumbnails and Captions With Free Tools

• ChatGPT image generation

  Free tier

  4 lessons: Free AI Image Generators Compared, Plus Editing (Is Midjourney Worth It?) · Image Prompting That Works · Make a Consistent Brand Image Set · Product Photos, Descriptions and Posts With AI

• CrewAI

  Open sourceFree tier

  4 lessons: CrewAI · Same Agent, Four Frameworks (+ TypeScript: Mastra, Vercel AI SDK) · Hierarchical Teams, and Why Multi-Agent Systems Fail · Agent Frameworks Directory

• Gemini CLI

  Open sourceFree tier

  4 lessons: AI Coding Tools Explained: Copilot, Cursor, Claude Code, Codex · Coding Assistants Compared on One Real Project · How Coding-Agent Harnesses Are Built (Claude Code, Codex) · Coding Assistants Directory

• Git + GitHub

  Free

  free / self-host (compute costs apply)

  4 lessons: Git and GitHub for AI Projects · Project: Ship a Public AI Study Helper · Test, Debug, Share and Deploy Your MCP Server (Remote + Clients) · Project: Build a Mini Coding-Agent Harness

• Google Veo

  Paid

  4 lessons: AI Video Generators and Avatars Explained · Generate Video From Code: APIs and Open Models · Project: Automated Explainer Video Pipeline · Image, Video and Voice Tools Directory

• GPU clouds (RunPod, Lambda, Vast.ai, E2E Networks)

  Paid

  4 lessons: Self-Host an Open Model on a GPU Cloud (and When Kubernetes Helps) · GPUs for Training: Colab, Kaggle, Cloud GPUs Safely · Free GPUs, Notebooks and GPU Clouds (India Notes) · Project: Benchmark Your Model Serving Stack

• Ideogram

  Free tier

  4 lessons: Free AI Image Generators Compared, Plus Editing (Is Midjourney Worth It?) · Image Prompting That Works · Make a Consistent Brand Image Set · Image, Video and Voice Tools Directory

• Microsoft Excel

  Paid

  4 lessons: AI in Excel and Google Sheets · AI for Finance, Accounting and Analysts · Reconcile and Clean Ledgers With AI · Monthly MIS Reports and Commentary With AI

• Next.js

  Open sourceFree

  free / self-host (compute costs apply)

  4 lessons: Next.js Front End for Your LLM Backend · Streaming Chat UI: Tokens, Stop and Retry · Add Login and Per-User Limits to Your AI App · Project: Ship a Public AI Study Helper

• Pipecat

  Open sourceFree

  free / self-host (compute costs apply)

  4 lessons: Latency, Turn-Taking and Interruptions · Build a Voice Agent With Pipecat · Voice Agents With Tools and RAG · Capstone: AI Receptionist

• Power Automate

  Free tier

  4 lessons: Power Automate With AI · n8n vs Make vs Zapier vs Power Automate · Automation Platforms Directory · Write SOPs and Automate Ops Checklists

• pytest

  Open sourceFree

  free / self-host (compute costs apply)

  4 lessons: Testing With pytest · DeepEval Tutorial · Tool-Call and MCP Contract Tests · DeepEval Advanced: Custom Metrics and Agent Tracing

• sentence-transformers

  Open sourceFree

  free / self-host (compute costs apply)

  4 lessons: Embeddings Explained With Code, Free and Local · Fine-Tune an Embedding Model on Your Domain · Dense Retrieval · Embeddings: Meaning as Numbers

• Streamlit

  Open sourceFree

  free / self-host (compute costs apply)

  4 lessons: Quick Interfaces: Streamlit and Gradio · AI-Built Dashboards in Streamlit and Looker Studio · Project: Sales Insights Assistant · Project: Document Summariser

• Agent2Agent (A2A) protocol

  Open source

  free / self-host (compute costs apply)

  3 lessons: Agent-to-Agent Protocols (A2A) · A2A Advanced: Agent Cards, Tasks, Streaming, Auth · Project: Two Agents, Two Frameworks, One A2A Link

• AutoGen / AG2

  Open sourceFree

  free / self-host (compute costs apply)

  3 lessons: AutoGen / AG2 (and Microsoft's Agent Stack) · Debate and Critique Agents · Agent Frameworks Directory

• Cursor

  Free tier

  3 lessons: AI Coding Tools Explained: Copilot, Cursor, Claude Code, Codex · Coding Assistants Compared on One Real Project · Coding Assistants Directory

• Descript

  Free tier

  3 lessons: AI Video Editing: CapCut and Descript · Turn Documents Into a Podcast Episode · Project: Repurpose One Video Into 10 Posts

• Elasticsearch

  Open sourceFree tier

  3 lessons: Elasticsearch and OpenSearch for Vector and Hybrid Search · Sparse Retrieval and BM25 · Hybrid Search

• ElevenLabs

  Free tier

  3 lessons: Build a Faceless Explainer Pipeline · AI Voice and Transcription Tools: Free vs Paid · Text-to-Speech for Agents

• Google Agent Development Kit (ADK)

  Open sourceFree

  free / self-host (compute costs apply)

  3 lessons: Google Agent Development Kit (ADK) · Agent Frameworks Directory · Project: Two Agents, Two Frameworks, One A2A Link

• Guardrails AI

  Open sourceFree tier

  3 lessons: Guardrails: Inputs, Outputs, Sandboxes, Least Privilege · Guardrail Tools: Llama Guard, NeMo Guardrails, Guardrails AI · Agent Defences That Hold Against Prompt Injection

• Haystack

  Open sourceFree

  free / self-host (compute costs apply)

  3 lessons: Modular RAG · Haystack Tutorial · LangChain vs LlamaIndex vs Haystack vs Plain Python

• Hugging Face PEFT

  Open sourceFree

  free / self-host (compute costs apply)

  3 lessons: Full Fine-Tuning vs Parameter-Efficient (PEFT) · LoRA Explained and Applied · QLoRA: Bigger Models on Small GPUs

• LangSmith

  Free tier

  3 lessons: Human Review Loops: Annotation Queues and Rubrics · LangSmith Evaluations: Datasets and Experiments · Eval, Observability and Security Tools Directory

• llama.cpp

  Open sourceFree

  free / self-host (compute costs apply)

  3 lessons: llama.cpp, GGUF and How Big a Model You Can Run · Merge, Export, Run Your Model (and Model Merging) · Small and On-Device Models: Laptops, Phones and Browsers

• Looker Studio

  Free

  free

  3 lessons: AI-Built Dashboards in Streamlit and Looker Studio · Project: Expiry Tracker and Reorder Sheet · Project: A Downtime Tracker and Weekly Plant Report

• Make

  Free tier

  3 lessons: Make Tutorial With AI · n8n vs Make vs Zapier vs Power Automate · Automation Platforms Directory

• Mem0

  Open sourceFree tier

  3 lessons: Long-Term and Graph Memory: Vector Stores, Mem0, Letta, Zep · Mem0 Hands-On: Extract, Update and Scope Memories per User · Test and Govern Agent Memory: Recall, Staleness, Deletion

• Milvus / Zilliz

  Open sourceFree tier

  3 lessons: Milvus Tutorial · Scaling RAG: Fresh Indexes, Latency, Cost, Millions of Docs · Vector Databases Directory

• NeMo Guardrails

  Open sourceFree

  free / self-host (compute costs apply)

  3 lessons: Guardrails: Inputs, Outputs, Sandboxes, Least Privilege · Guardrail Tools: Llama Guard, NeMo Guardrails, Guardrails AI · Agent Defences That Hold Against Prompt Injection

• Neo4j

  Free tier

  3 lessons: Graph RAG: GraphRAG, LightRAG and Neo4j · Knowledge Graphs for Agents: Query and Update Tools · Project: Agent With Knowledge-Graph Memory

• Open-weight models (Llama, Qwen, Gemma, Mistral, DeepSeek)

  Open source

  free / self-host (compute costs apply)

  3 lessons: The Model Landscape: Closed vs Open Weights, Sizes, Benchmarks · Open-Weight Models Explained: Llama, Qwen, Gemma, Mistral, DeepSeek · Small and On-Device Models: Laptops, Phones and Browsers

• pgvector (Postgres)

  Open sourceFree

  free / self-host (compute costs apply)

  3 lessons: pgvector: Vectors in Postgres · Choose a Vector DB (incl. LanceDB, Redis, Atlas): Benchmark on Your Data · Vector Databases Directory

• Pinecone

  Free tier

  3 lessons: Pinecone Tutorial · Choose a Vector DB (incl. LanceDB, Redis, Atlas): Benchmark on Your Data · Vector Databases Directory

• PydanticAI

  Open sourceFree

  free / self-host (compute costs apply)

  3 lessons: PydanticAI · Same Agent, Four Frameworks (+ TypeScript: Mastra, Vercel AI SDK) · Agent Frameworks Directory

• Runway

  Free tier

  3 lessons: AI Video Generators and Avatars Explained · Generate Video From Code: APIs and Open Models · Image, Video and Voice Tools Directory

• SGLang

  Open sourceFree

  free / self-host (compute costs apply)

  3 lessons: Inference Optimisation: KV Cache and Prefix Caching · Speculative Decoding and Continuous Batching · Project: Benchmark Your Model Serving Stack

• VS Code

  Free

  free / self-host (compute costs apply)

  3 lessons: Install Python and VS Code (Windows, Mac, Linux) · Debug, Script and Document With Free AI Coding Help · Project: Automate One Boring IT Task Safely

• Weaviate

  Open sourceFree tier

  3 lessons: Weaviate Tutorial · Hybrid Search · Vector Databases Directory

• AWS Lambda

  Free tier

  2 lessons: Deploy: HF Spaces, Render, Cloud Run, Lambda, Modal · Deployment Platforms Directory

• Axolotl

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Axolotl · Training Tools Directory

• BGE embeddings / rerankers

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Choosing an Embedding Model: Paid vs Open, Multilingual, ColBERT · Rerankers: Cross-Encoders, Cohere Rerank, BGE

• bitsandbytes

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: QLoRA: Bigger Models on Small GPUs · Quantization: GGUF, GPTQ, AWQ, bitsandbytes

• Braintrust

  Free tier

  2 lessons: Braintrust: Experiments, Scorers and autoevals · One Eval, Six Tools: Pick Your Eval Stack (Free vs Paid)

• Cohere Embed + Rerank

  Free tier

  2 lessons: Choosing an Embedding Model: Paid vs Open, Multilingual, ColBERT · Rerankers: Cross-Encoders, Cohere Rerank, BGE

• ComfyUI

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Stable Diffusion, FLUX and ComfyUI Locally (+ ControlNet) · Train an Image LoRA on Your Style or Product

• Dify

  Open sourceFree tier

  2 lessons: No-Code RAG: NotebookLM, Dify, Flowise · Dify, Flowise and Langflow

• Docling

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Hard PDFs: Tables, Scans and OCR · Document AI: OCR, Forms and Tables

• DuckDB

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Text-to-SQL: Ask Your Database in Plain English · Project: Sales Insights Assistant

• FAISS

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: FAISS Tutorial · Vector Databases Directory

• faster-whisper

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Whisper Locally With Speaker Diarization · Project: Meeting Assistant

• Flowise

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: No-Code RAG: NotebookLM, Dify, Flowise · Dify, Flowise and Langflow

• garak

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Red-Team Your AI App: garak and PyRIT · Red-Team Agents With PyRIT, garak and promptfoo

• GGUF / llama.cpp quantize

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: llama.cpp, GGUF and How Big a Model You Can Run · Quantization: GGUF, GPTQ, AWQ, bitsandbytes

• Google Cloud Run

  Free tier

  2 lessons: Deploy: HF Spaces, Render, Cloud Run, Lambda, Modal · Deployment Platforms Directory

• Gradio

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Share an AI Demo From Colab With Gradio · Quick Interfaces: Streamlit and Gradio

• Hugging Face Hub

  Free tier

  2 lessons: The Model Landscape: Closed vs Open Weights, Sizes, Benchmarks · Hugging Face for Beginners: Hub, Pipelines, Inference Providers

• Hugging Face Spaces

  Free tier

  2 lessons: Deploy Your AI App on Free Tiers, No Card Needed · Deployment Platforms Directory

• Instructor

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Structured Output: JSON Schema, Pydantic, Invoice Extractor · Project: Receipt and ID Checker

• Kaggle Notebooks

  Free

  free / self-host (compute costs apply)

  2 lessons: GPUs for Training: Colab, Kaggle, Cloud GPUs Safely · Free GPUs, Notebooks and GPU Clouds (India Notes)

• Kling

  Free tier

  2 lessons: AI Video Generators and Avatars Explained · Image, Video and Voice Tools Directory

• Kokoro TTS

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: AI Voice and Transcription Tools: Free vs Paid · Text-to-Speech for Agents

• Letta

  Open sourceFree tier

  2 lessons: Long-Term and Graph Memory: Vector Stores, Mem0, Letta, Zep · Letta (MemGPT-Style) Agents: Self-Editing Memory

• LiveKit Agents

  Open sourceFree tier

  2 lessons: Build a Voice Agent With LiveKit Agents · Test, Monitor and Deploy Voice Agents

• Llama Guard

  Open source

  free / self-host (compute costs apply)

  2 lessons: Guardrail Tools: Llama Guard, NeMo Guardrails, Guardrails AI · Safety Evals: Jailbreaks, Refusals and Over-Refusal

• Microsoft 365 Copilot

  Paid

  2 lessons: Microsoft Copilot Guide: Free and Microsoft 365 · AI for Email, Docs, Meetings and Slides

• Microsoft GraphRAG

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Graph RAG: GraphRAG, LightRAG and Neo4j · Knowledge Graphs for Agents: Query and Update Tools

• Microsoft Presidio

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: RAG Security: Permissions, PII, Poisoned Documents · Privacy Engineering for AI Apps: PII and Retention

• Modal

  Free tier

  2 lessons: Deploy: HF Spaces, Render, Cloud Run, Lambda, Modal · Deployment Platforms Directory

• Pydantic

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Type Hints and Pydantic Models · Structured Output: JSON Schema, Pydantic, Invoice Extractor

• PyRIT

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Red-Team Your AI App: garak and PyRIT · Red-Team Agents With PyRIT, garak and promptfoo

• Render / Railway

  Free tier

  2 lessons: Deploy Your AI App on Free Tiers, No Card Needed · Deployment Platforms Directory

• scikit-learn

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Your First Model With scikit-learn · Metrics and Overfitting: Precision, Recall, F1, Validation

• smolagents

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: smolagents · Agent Frameworks Directory

• SQLite

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Text-to-SQL: Ask Your Database in Plain English · Build a Chat-With-Your-Database Agent

• Supabase

  Free tier

  2 lessons: Add Login and Per-User Limits to Your AI App · pgvector: Vectors in Postgres

• Temporal (durable execution)

  Open sourceFree tier

  2 lessons: Agent Reliability: Retries, Idempotency, Checkpoints · Durable Long-Running Agents: Resume After a Crash

• torchtune

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: torchtune · Training Tools Directory

• TruLens

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Component RAG Evals: Retriever, Reranker, Generator · TruLens: Feedback Functions and the RAG Triad

• Twilio

  Paid

  2 lessons: Connect a Voice Agent to a Phone Number · Capstone: AI Receptionist

• uv

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Virtual Environments and Packages With uv · Your First MCP Server in 10 Minutes

• Vercel AI SDK

  Open sourceFree

  free / self-host (compute costs apply)

  2 lessons: Next.js Front End for Your LLM Backend · Streaming Chat UI: Tokens, Stop and Retry

• Adobe Firefly

  Free tier

  1 lesson: Free AI Image Generators Compared, Plus Editing (Is Midjourney Worth It?)

• AI4Bharat models

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Voice AI for Indian Languages

• AssemblyAI

  Free tier

  1 lesson: Speech-to-Text: Whisper, Deepgram, AssemblyAI

• autoevals (Braintrust scorers library)

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Braintrust: Experiments, Scorers and autoevals

• AWQ / GPTQ tools

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Quantization: GGUF, GPTQ, AWQ, bitsandbytes

• AWS Bedrock

  Paid

  1 lesson: Enterprise Clouds: Azure OpenAI, Bedrock, Vertex

• Azure OpenAI

  Paid

  1 lesson: Enterprise Clouds: Azure OpenAI, Bedrock, Vertex

• Bolt

  Free tier

  1 lesson: Build a Web App by Describing It: Lovable, Bolt, v0, Replit

• browser-use

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Build a Browser Agent With browser-use and Playwright

• Cloudflare AI Gateway

  Free tier

  1 lesson: AI Gateways, Budgets and Kill Switches

• Computer-use APIs (Anthropic / OpenAI)

  Paid

  1 lesson: Computer-Use APIs

• Deepgram

  Free tier

  1 lesson: Speech-to-Text: Whisper, Deepgram, AssemblyAI

• Exotel

  Paid

  1 lesson: Connect a Voice Agent to a Phone Number

• Florence-2

  Open source

  free / self-host (compute costs apply)

  1 lesson: Open Vision-Language Models Locally

• FLUX (open weights)

  Open source

  free / self-host (compute costs apply)

  1 lesson: Image, Video and Voice Tools Directory

• Google Apps Script

  Free

  free / self-host (compute costs apply)

  1 lesson: Google Apps Script + Gemini API

• Google Imagen (in Gemini)

  Free tier

  1 lesson: Free AI Image Generators Compared, Plus Editing (Is Midjourney Worth It?)

• Google Lens

  Free

  free

  1 lesson: Fact-Check Viral AI Images and Videos With Free Tools

• Google Vertex AI

  Paid

  1 lesson: Enterprise Clouds: Azure OpenAI, Bedrock, Vertex

• Groq

  Free tier

  1 lesson: LLM APIs and Local Runtimes Directory

• Leonardo.ai

  Free tier

  1 lesson: Free AI Image Generators Compared, Plus Editing (Is Midjourney Worth It?)

• LightRAG

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Graph RAG: GraphRAG, LightRAG and Neo4j

• LLaMA-Factory

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Training Tools Directory

• LlamaParse

  Free tier

  1 lesson: Hard PDFs: Tables, Scans and OCR

• lm-evaluation-harness

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Benchmarks and Their Limits: Contamination, Saturation

• Lovable

  Free tier

  1 lesson: Build a Web App by Describing It: Lovable, Bolt, v0, Replit

• mergekit

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Model Merging With mergekit: SLERP, TIES, DARE

• Microsoft Copilot Studio

  Paid

  1 lesson: Microsoft Copilot Studio

• Midjourney

  Paid

  1 lesson: Image, Video and Voice Tools Directory

• nanoGPT-style code

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Build and Train a Toy GPT

• nomic-embed

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Choosing an Embedding Model: Paid vs Open, Multilingual, ColBERT

• OpenAI embeddings

  Paid

  1 lesson: Choosing an Embedding Model: Paid vs Open, Multilingual, ColBERT

• OpenAI Evals (open-source framework + Evals API)

  Open sourcePaid

  1 lesson: OpenAI Evals: Open-Source Framework and Paid Evals API

• OpenAI Sora

  Paid

  1 lesson: AI Video Generators and Avatars Explained

• OpenRouter

  Free tier

  1 lesson: LLM APIs and Local Runtimes Directory

• OpenSearch

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Elasticsearch and OpenSearch for Vector and Hybrid Search

• Perplexity Comet

  Free tier

  1 lesson: AI Browsers and Agent Modes: What Works Today

• Pika

  Free tier

  1 lesson: AI Video Generators and Avatars Explained

• Playwright

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Build a Browser Agent With browser-use and Playwright

• Playwright MCP

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Build a Browser Agent With browser-use and Playwright

• Plivo

  Paid

  1 lesson: Connect a Voice Agent to a Phone Number

• Portkey

  Free tier

  1 lesson: AI Gateways, Budgets and Kill Switches

• pyannote.audio

  Open source

  free / self-host (compute costs apply)

  1 lesson: Project: Meeting Assistant

• PyMuPDF

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Loading PDFs, Docs and Web Pages

• python-dotenv

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Environment Variables and API Keys, Safely

• RAGFlow

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: No-Code RAG: NotebookLM, Dify, Flowise

• rank-bm25

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Sparse Retrieval and BM25

• Realtime speech APIs (OpenAI Realtime / Gemini Live)

  Paid

  1 lesson: Speech-to-Speech Realtime APIs

• Redis (semantic cache)

  Free tier

  1 lesson: Caching: Prompt Caching and Semantic Caching

• Replit

  Free tier

  1 lesson: Build a Web App by Describing It: Lovable, Bolt, v0, Replit

• requests / httpx

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Call an API From Python

• Retell AI

  Free tier

  1 lesson: Your First Voice Agent, No Code (and Hosted Platforms Compared)

• Sarvam AI

  Free tier

  1 lesson: Voice AI for Indian Languages

• Stable Diffusion

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Stable Diffusion, FLUX and ComfyUI Locally (+ ControlNet)

• Suno

  Free tier

  1 lesson: AI Music: Suno and Udio, and the Licence Fine Print

• tiktoken / tokenizers

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Build a BPE Tokenizer

• TransformerLens

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Interpretability Basics: Look Inside a Model

• Udio

  Free tier

  1 lesson: AI Music: Suno and Udio, and the Licence Fine Print

• Ultralytics YOLO

  Open source

  free / self-host (compute costs apply)

  1 lesson: Object Detection With YOLO

• Unstructured

  Open sourceFree tier

  1 lesson: Hard PDFs: Tables, Scans and OCR

• v0

  Free tier

  1 lesson: Build a Web App by Describing It: Lovable, Bolt, v0, Replit

• Vapi

  Free tier

  1 lesson: Your First Voice Agent, No Code (and Hosted Platforms Compared)

• Vercel

  Free tier

  1 lesson: Deploy Your AI App on Free Tiers, No Card Needed

• Voyage AI embeddings

  Free tier

  1 lesson: Choosing an Embedding Model: Paid vs Open, Multilingual, ColBERT

• Weights & Biases

  Free tier

  1 lesson: Make It Better: Data, Hyperparameters, Continued Pre-training, Multi-GPU

• WSL

  Free

  free / self-host (compute costs apply)

  1 lesson: WSL and Docker Basics for AI Developers

• XGBoost

  Open sourceFree

  free / self-host (compute costs apply)

  1 lesson: Trees and Gradient Boosting

• Zep

  Free tier

  1 lesson: Long-Term and Graph Memory: Vector Stores, Mem0, Letta, Zep

• Beautiful Soup

  Open sourceFree

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• ColBERT / RAGatouille

  Open sourceFree

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• DeepSeek chat

  Free

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• DeepSpeed / FSDP

  Open sourceFree

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• DSPy

  Open sourceFree

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• Fireflies.ai

  Free tier

  Covered in the tools directory lessons.

• Gamma

  Free tier

  Covered in the tools directory lessons.

• Grok

  Free tier

  Covered in the tools directory lessons.

• HeyGen

  Free tier

  Covered in the tools directory lessons.

• Hugging Face Inference Providers

  Free tier

  Covered in the tools directory lessons.

• JupyterLab

  Open sourceFree

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• Kubernetes

  Open source

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• LanceDB

  Open sourceFree

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• Langflow

  Open sourceFree

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• LM Studio

  Free

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• LTX-Video

  Open source

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• Mastra

  Open sourceFree

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• Meta AI

  Free

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• Microsoft Agent Framework / Semantic Kernel

  Open sourceFree

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• Mistral Le Chat

  Free tier

  Covered in the tools directory lessons.

• MongoDB Atlas Vector Search

  Free tier

  Covered in the tools directory lessons.

• Otter.ai

  Free tier

  Covered in the tools directory lessons.

• Qwen Chat

  Free

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• Redis vector search

  Free tier

  Covered in the tools directory lessons.

• Synthesia

  Paid

  Covered in the tools directory lessons.

• Text Generation Inference

  Open source

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.

• Together AI

  Paid

  Covered in the tools directory lessons.

• Wan video models

  Open source

  free / self-host (compute costs apply)

  Covered in the tools directory lessons.