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Best Open Source vector database Libraries

A curated list of the most popular GitHub repositories tagged with vector database. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.

#1pathwaycom/llm-app

Ready-to-run cloud templates for RAG, AI pipelines, and enterprise search with live data. 🐳Docker-friendly.⚡Always in sync with Sharepoint, Google Drive, S3, Kafka, PostgreSQL, real-time data APIs, and more.

56,280Jupyter Notebook
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#2meilisearch/meilisearch

A lightning-fast search engine API bringing AI-powered hybrid search to your sites and applications.

56,011Rust
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#3Mintplex-Labs/anything-llm

The all-in-one Desktop & Docker AI application with built-in RAG, AI agents, No-code agent builder, MCP compatibility, and more.

54,814JavaScript
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#4run-llama/llama_index

LlamaIndex is the leading document agent and OCR platform

47,100Python
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#5milvus-io/milvus

Milvus is a high-performance, cloud-native vector database built for scalable vector ANN search

42,914Go
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#6qdrant/qdrant

Qdrant - High-performance, massive-scale Vector Database and Vector Search Engine for the next generation of AI. Also available in the cloud https://cloud.qdrant.io/

28,981Rust
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#7chroma-core/chroma

Open-source search and retrieval database for AI applications.

26,222Rust
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#8memvid/memvid

Memory layer for AI Agents. Replace complex RAG pipelines with a serverless, single-file memory layer. Give your agents instant retrieval and long-term memory.

13,175Rust
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#9topoteretes/cognee

Knowledge Engine for AI Agent Memory in 6 lines of code

12,449Python
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#10neuml/txtai

💡 All-in-one AI framework for semantic search, LLM orchestration and language model workflows

12,192Python
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#11yichuan-w/LEANN

[MLsys2026]: RAG on Everything with LEANN. Enjoy 97% storage savings while running a fast, accurate, and 100% private RAG application on your personal device.

9,999Python
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#12oceanbase/oceanbase

The Fastest Distributed Database for Transactional, Analytical, and AI Workloads.

9,979C++
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#13databendlabs/databend

Data Agent Ready Warehouse : One for Analytics, Search, AI, Python Sandbox. — rebuilt from scratch. Unified architecture on your S3.

9,160Rust
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#14lancedb/lancedb

Developer-friendly OSS embedded retrieval library for multimodal AI. Search More; Manage Less.

9,029HTML
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#15activeloopai/deeplake

Database for AI. Store Vectors, Images, Texts, Videos, etc. Use with LLMs/LangChain. Store, query, version, & visualize any AI data. Stream data in real-time to PyTorch/TensorFlow. https://activeloop.ai

9,008C++
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#16vespa-engine/vespa

AI + Data, online. https://vespa.ai

6,789Java
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#17postgresml/postgresml

Postgres with GPUs for ML/AI apps.

6,703Rust
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