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  1. 726

    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. 773

    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. 730

    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. 2757

    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. 2807

    SQLite-Vector

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

    Extensiongithub.com/sqliteai/sqlite-vectorOpen Source

    Developer Tools

  6. 2510

    Pinecone

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

    Infrastructurepinecone.ioFreemium

    @pinecone · Developer Tools

  7. 197

    LightRAG

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

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

    hkuds · AI Tools

  8. 1031

    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. 1592

    post-graph-rag

    Python library running GraphRAG inside PostgreSQL, where newer documents can supersede older facts.

    Library / Frameworkgithub.com/crajah/post-graph-ragOpen Source

    Developer Tools

  10. 114

    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. 2804

    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. 3915

    pplx-embed-v2-context-9b-preview

    Contextual embedding model that encodes RAG document chunks together with 2048-dimension INT8 output.

    Modelhuggingface.coOpen Source

    AI Tools

  13. 2902

    agentdb

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

    Library / Frameworkgithub.com/ruvnet/agentdbOpen Source

    ruvnet · AI Tools

  14. 203

    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

  15. 1497

    Raggy

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

    Utilitygithub.com/paulknysh/raggyOpen Source

    Developer Tools

  16. 956

    Ragas

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

    Library / Frameworkgithub.com/explodinggradients/ragasOpen Source

    explodinggradients · Developer Tools

  17. 3241

    pg_vectorsearch

    PostgreSQL extension adding PRISM approximate nearest neighbor vector indexes, alpha stage.

    Extensiongithub.com/timescale/pg_vectorsearchOpen Source

    Developer Tools

  18. 2141

    Vector Transfer

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

    Servicegithub.com/polign/vector-transferOpen Source

    Developer Tools

  19. 292

    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

  20. 1767

    NanoVector

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

    Library / Frameworkgithub.com/eminsk/nanovectorOpen Source

    Developer Tools

  21. 98

    PageIndex

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

    github.com/vectifyai/pageindexOpen Source

    vectifyai · AI Tools

  22. 3108

    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

  23. 3363

    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

  24. 1405

    EmbedFlow

    Migrates a vector index to a new embedding model gradually, without re-embedding the corpus first.

    Library / Frameworkgithub.com/arnsri33/embedflowOpen Source

    Developer Tools

  25. 3815

    rag-evaluation-starter

    Python script that scores a RAG pipeline on recall, faithfulness, relevance and F1 against a golden set.

    Template / Startergithub.com/infrixo-systems/rag-evaluation-starterOpen Source

    Developer Tools

  26. 3164

    RAGEval

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

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

    openbmb · Developer Tools

  27. 1227

    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

  28. 2764

    TurboVec

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

    Library / Frameworkgithub.com/ryancodrai/turbovec

    ryancodrai · AI Tools

  29. 674

    RAGFlow

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

    Servicegithub.com/infiniflow/ragflowOpen Source

    infiniflow · AI Tools

  30. 2242

    arc-decide-0.4b-v0.2

    CPU-first 0.41B model returning calibrated probabilities for RAG relevance, injection, grounding and routing checks.

    Modelhuggingface.coOpen Source

    AI Tools