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  1. 717

    Qdrant

    Open-source vector database and similarity search engine written in Rust for storing embeddings at scale.

    Infrastructuregithub.com/qdrant/qdrantFreemium

    qdrant · Developer Tools

  2. 757

    Weaviate

    Open-source vector database combining vector and hybrid search with cloud-native scaling for retrieval and RAG.

    Infrastructuregithub.com/weaviate/weaviateFreemium

    weaviate · Developer Tools

  3. 714

    Chroma

    Open-source AI-native retrieval database for adding embeddings-based search to apps, common in LLM prototypes.

    Infrastructuregithub.com/chroma-core/chromaFreemium

    chroma-core · Developer Tools

  4. 733

    pgvector

    Postgres extension that adds vector similarity search, storing embeddings in columns queried with plain SQL.

    Extensiongithub.com/pgvector/pgvectorOpen Source

    pgvector · Developer Tools

  5. 2140

    SQLite-Vector

    Adds SIMD-accelerated vector search and quantized indexing to embedded SQLite databases.

    github.com/sqliteai/sqlite-vectorOpen Source

    Developer Tools

  6. 1320

    Pinecone

    Serverless managed vector database for storing and querying embeddings at scale, common as a RAG retrieval layer.

    Infrastructurepinecone.ioFreemium

    @pinecone · Developer Tools

  7. 201

    LightRAG

    Retrieval-augmented generation system combining vector search with graph-based knowledge representation.

    https://github.com/hkuds/lightragOpen Source

    hkuds · AI Tools

  8. 929

    RuVector

    Real-time vector graph memory database written in Rust, built for self-learning agentic AI memory at scale.

    Infrastructuregithub.com/ruvnet/ruvectorOpen Source

    ruvnet · AI Tools

  9. 1161

    post-graph-rag

    A Python library that implements GraphRAG natively inside PostgreSQL, using an LLM to extract entities and relations into a property graph stored alongside pgvector embeddings, then answering queries by fusing vector similarity, graph traversal, and full-text search. Its key feature is temporal fact resolution — newer documents can supersede or close earlier extracted facts rather than creating contradictory edges — and it reports benchmark results beating Graphiti and other GraphRAG systems on LongMemEval and ECT-QA.

    github.com/crajah/post-graph-ragOpen Source

    Developer Tools

  10. 117

    RAG Anything

    Multimodal RAG framework that ingests text, images, tables, and equations from documents into one query pipeline.

    Library / Frameworkgithub.com/hkuds/rag-anything

    hkuds · AI Tools

  11. 1410

    VisRAG

    RAG pipeline built on vision-language models that indexes PDFs and slides as images, skipping text parsing.

    Library / Frameworkhttps://github.com/openbmb/visragOpen Source

    openbmb · AI Tools

  12. 1540

    agentdb

    Vector memory for agents with feedback-aware retrieval that learns which results actually helped.

    Library / Frameworkgithub.com/ruvnet/agentdbOpen Source

    ruvnet · AI Tools

  13. 204

    GraphRAG

    Modular retrieval-augmented generation system that builds knowledge graphs from documents for richer LLM answers.

    https://github.com/microsoft/graphragOpen Source

    microsoft · AI Tools

  14. 2324

    Raggy

    A local CLI tool for RAG search and Q&A over your own documents, images included via OCR.

    github.com/paulknysh/raggyOpen Source

    Developer Tools

  15. 868

    Ragas

    Evaluation framework for RAG pipelines scoring retrieval and generation on faithfulness and context precision.

    Library / Frameworkgithub.com/explodinggradients/ragasOpen Source

    explodinggradients · Developer Tools

  16. 2513

    Vector Transfer

    Moves vector embeddings and metadata between vector databases with resumable checkpoints.

    github.com/polign/vector-transferOpen Source

    Developer Tools

  17. 295

    UltraRAG

    Low-code MCP framework from OpenBMB for assembling RAG pipelines from retrieval, rerank, and generation parts.

    Library / Frameworkhttps://github.com/openbmb/ultraragOpen Source

    openbmb · AI Tools

  18. 2417

    NanoVector

    Tiny 120KB zero-dependency vector search engine in C, built for AI agent memory without the bloat.

    github.com/eminsk/nanovectorOpen Source

    Developer Tools

  19. 102

    PageIndex

    Vectorless RAG system that builds hierarchical tree indexes from documents and retrieves through LLM reasoning.

    github.com/vectifyai/pageindexOpen Source

    vectifyai · AI Tools

  20. 1659

    MongoDB RAG Agent

    Hybrid RAG agent on MongoDB and Pydantic AI that fuses semantic and text search with reciprocal rank fusion.

    Agenthttps://github.com/coleam00/MongoDB-RAG-AgentOpen Source

    coleam00 · AI Agents

  21. 1816

    Knowledge Graph Hybrid RAG

    Hybrid RAG system on Neo4j combining SBERT embeddings, graph traversal, and BM25 search over 61K papers.

    https://github.com/safishamsi/knowledge-graph-based-hybrid-rag-systemOpen Source

    safishamsi · AI Tools

  22. 1058

    EmbedFlow

    EmbedFlow enables progressive migration between embedding models over an existing vector index by serving candidates from the old model's index while target vectors are materialized in the background, avoiding a full corpus re-embedding before cutover. It provides migration-safety diagnostics, a measurement framework for candidate-depth quality loss, and integrations with FAISS, Qdrant, and pgvector.

    Library / Frameworkgithub.com/arnsri33/embedflowOpen Source

    Developer Tools

  23. 1702

    RAGEval

    Benchmark toolkit that measures how well retrieval-augmented generation pipelines answer questions.

    Evaluation / Datasethttps://github.com/OpenBMB/RAGEvalOpen Source

    openbmb · Developer Tools

  24. 1004

    VideoRAG

    RAG system for video that lets you chat with hours of footage and get cited timestamps and clips back.

    Applicationhttps://github.com/hkuds/videoragOpen Source

    hkuds · AI Tools

  25. 767

    TurboVec

    Vector index built on TurboQuant, implemented in Rust and exposed through Python bindings.

    Library / Frameworkgithub.com/ryancodrai/turbovec

    ryancodrai · AI Tools

  26. 1967

    RAGFlow

    RAG engine with deep document parsing, template-based chunking, and citation-grounded answers.

    Servicegithub.com/infiniflow/ragflowOpen Source

    infiniflow · AI Tools

  27. 2527

    castrag

    Resumable pipeline that transcribes podcast archives into searchable summaries and RAG-based Q&A.

    github.com/snowmac/castragOpen Source

    Developer Tools

  28. 2928

    Anydoc

    Converts Word, PDF, Excel and more into consistent Markdown in milliseconds, no ML needed.

    Library / Frameworkgithub.com/firecrawl/anydocOpen Source

    @nickscamara_ · Developer Tools

  29. 1691

    Human-in-the-Loop RAG Agent

    RAG agent built with CopilotKit and Pydantic AI that lets a human validate retrieved sources in real time.

    Agenthttps://github.com/coleam00/human-in-the-loop-rag-agentOpen Source

    coleam00 · AI Agents

  30. 1098

    RVM

    Virtual machine written in Rust that runs AI-generated code in a deterministic, isolated runtime.

    Runtimegithub.com/ruvnet/rvmOpen Source

    ruvnet · Developer Tools