Open source information-retrieval projects
Every project in the registry tagged information-retrieval, ranked by real GitHub adoption.
📑 PageIndex: Document Index for Vectorless, Reasoning-based RAG
Unified AI-powered enterprise search across company data
Open-source AI orchestration framework for building context-engineered, production-ready LLM applications. Design modular pipelines and agent workflows with exp
AI-native vector database for intuitive applications
💡 All-in-one AI framework for semantic search, LLM orchestration and language model workflows
Harness LLMs with Multi-Agent Programming
Related tags
Frequently asked questions
How many open source information-retrieval projects are there?
This registry tracks 6 projects tagged information-retrieval, with 128,229 GitHub stars between them. The most-adopted is PageIndex at 35,678 stars.
Are these information-retrieval projects free to use?
Yes — 4 of the 6 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 information-retrieval 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 information-retrieval projects still maintained?
6 of the 6 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.