Open source. Open possibilities.

A practical, from-scratch guide to training LLMs using PyTorch, covering data preparation, building a Transformer, pretraining, and post-training with SFT, DPO, PPO, and GRPO.

Haystack is an open-source AI orchestration framework for building production-ready LLM applications, RAG systems, and autonomous agents in Python.

Langflow is a visual platform for building, deploying, and orchestrating AI-powered agents and workflows. It offers a drag-and-drop interface, interactive playground, multi-agent support, and can deploy as API or MCP server. Supports all major LLMs and vector databases.

LangExtract is a Python library from Google that uses LLMs to extract structured information from unstructured text, grounding every extraction to its exact source location and generating interactive HTML visualizations.