Haystack

Verdict: deepset's open-source Python framework for production RAG pipelines and agents, with modular components and broad model and vector-DB support.

Free (Apache-2.0 open source); deepset platform paid · Official site: https://haystack.deepset.ai · source checked 2026-10-21 (HTTP 200)

GitHub repo · ★ 26.8k stars (as of 2026-10-21) · More open-source AI

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