Open source semantic-search projects
Every project in the registry tagged semantic-search, ranked by real GitHub adoption.
A lightweight, lightning-fast, in-process vector database
Developer-friendly OSS embedded retrieval library for multimodal AI. Search More; Manage Less.
Jupyter Notebooks to help you get hands-on with Pinecone vector databases
Local-first AI job intelligence workbench for scraping roles, ranking fit, and generating tailored application materials.
Infinispan is an open source data grid platform and highly scalable NoSQL cloud data store.
An open-source, local-first writing workspace where you can write with Claude Code and Codex, drawing on your own sources and past work.
🍁 Sycamore is an LLM-powered search and analytics platform for unstructured data.
Related tags
Frequently asked questions
How many open source semantic-search projects are there?
This registry tracks 7 projects tagged semantic-search, with 35,371 GitHub stars between them. The most-adopted is zvec at 15,964 stars.
Are these semantic-search projects free to use?
Yes — 7 of the 7 carry an explicit open-source licence across 3 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 semantic-search 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 semantic-search projects still maintained?
7 of the 7 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.