LlamaIndex

LlamaIndex is a powerful open-source data framework that connects LLMs to your data. With 36,000+ GitHub stars, it provides data connectors for over 160 sources, flexible index structures, and powerful query engines for building production-ready RAG (Retrieval-Augmented Generation) applications. Whether you’re building a simple Q&A bot over documents or a complex multi-agent system, LlamaIndex offers the tools you need: document parsing, chunking, embedding management, vector store integration, advanced retrieval strategies, and agentic reasoning. It supports Python and TypeScript, integrates with LangChain, and is used by thousands of developers worldwide.