Open source vector-database projects
Every project in the registry tagged vector-database, ranked by real GitHub adoption.
LlamaIndex is the document processing platform for AI
Self-evolving Context Database for AI Agents. Unify Agent Memory, Knowledge RAG and Skills.
📑 PageIndex: Document Index for Vectorless, Reasoning-based RAG
Developer-friendly OSS embedded retrieval library for multimodal AI. Search More; Manage Less.
Full-text & vector search at the edge.
Open-source framework for building agentic apps in JavaScript, Go, Dart, and Python, built and used in production by Google
Knowhere extracts, parses, and outputs structured chunks ready for AI Agents and RAG.
Jupyter Notebooks to help you get hands-on with Pinecone vector databases
pingcap/autoflow is a Graph RAG based and conversational knowledge base tool built with TiDB Serverless Vector Storage. Demo: https://tidb.ai
Distributed vector search for AI-native applications
Local-first AI job intelligence workbench for scraping roles, ranking fit, and generating tailored application materials.
The Agentic Framework of the PHP ecosystem to build production-ready AI driven applications. Connect components (LLMs, Tools, vector DBs, memory) to agents that
OpenCode plugin that gives coding agents persistent memory using local vector database
A multi-modal vector database that supports upserts and vector queries using unified SQL (MySQL-Compatible) on structured and unstructured data, while meeting t
The open document intelligence platform for builders and hackers - DMS for the agentic world
Python client for Qdrant vector search engine
Infinispan is an open source data grid platform and highly scalable NoSQL cloud data store.
local-first semantic code search engine
Benchmark for vector databases.
ID-based RAG FastAPI: Integration with Langchain and PostgreSQL/pgvector
Long-term memory for AI assistants. Graph + vector store that recalls decisions, relationships, and context across sessions.
NextPlaid, ColGREP: Multi-vector search, from database to coding agents.
Related tags
Frequently asked questions
How many open source vector-database projects are there?
This registry tracks 23 projects tagged vector-database, with 193,166 GitHub stars between them. The most-adopted is llama_index at 52,779 stars.
Are these vector-database projects free to use?
Yes — 22 of the 23 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 vector-database 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 vector-database projects still maintained?
22 of the 23 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.