LlamaIndex

Verdict: Python framework for building RAG and document agents over your own data, with hundreds of data connectors. A standard choice for LLM apps on private docs.

Free (MIT open source); LlamaCloud paid · Official site: https://developers.llamaindex.ai · source checked 2026-10-21 (HTTP 200)

GitHub repo · ★ 52.6k stars (as of 2026-10-21) · More open-source AI

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