Open source retrieval-augmented-generation projects
Every project in the registry tagged retrieval-augmented-generation, ranked by real GitHub adoption.
[EMNLP2025] LightRAG: Simple and Fast Retrieval-Augmented Generation
📑 PageIndex: Document Index for Vectorless, Reasoning-based RAG
💡 All-in-one AI framework for semantic search, LLM orchestration and language model workflows
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Frequently asked questions
How many open source retrieval-augmented-generation projects are there?
This registry tracks 4 projects tagged retrieval-augmented-generation, with 91,406 GitHub stars between them. The most-adopted is LightRAG at 39,726 stars.
Are these retrieval-augmented-generation projects free to use?
Yes — 4 of the 4 carry an explicit open-source licence across 2 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which retrieval-augmented-generation project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these retrieval-augmented-generation projects still maintained?
4 of the 4 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.