// Retrieval, vector DBs & embeddings
Search & vector stores
Vector databases, RAG retrieval frameworks and embedding tools.
57 tools56 open sourcechecked 2026-10-22Compare side by side →
How to choose · start with these three
- · Prototype/local: embedded Chroma or LanceDB, zero ops
- · Production: Qdrant, Milvus; already on Postgres → pgvector
- · Hybrid keyword + semantic: Meilisearch, Elasticsearch
57 / 57 items
qdrant v1.19.2 ★ 35k 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/ Open source APISDK chroma 1.5.9 ★ 30k Search infrastructure for AI Open source SDKAPI pgvector v0.8.7 ★ 23k Open-source vector similarity search for Postgres Open source SQL semantica ★ 14k Graph-native infrastructure for context and accountable AI. Open source SDK PageIndex ★ 39k Document index for vectorless, reasoning-based RAG. Open source SDK zvec v0.8.0 ★ 16k Lightweight in-process vector database. Open source embedded llmware ★ 15k Unified framework for enterprise RAG with small specialized models. Open source Python cocoindex ★ 12k Incremental engine for long-horizon agents. Open source SDK airweave ★ 6.6k Open-source context retrieval layer for AI agents. Open source server code-graph-rag v0.2.14 ★ 5.3k Ultimate RAG for your monorepo. Open source Python Hyper-Extract ★ 4.2k Transform unstructured text into structured knowledge with hypergraphs. Open source Python pipeshub-ai ★ 3.8k Open-source AI context layer unifying business data. Open source server pathway v0.33.0 ★ 62k Python ETL framework for stream processing, real-time analytics, LLM pipelines, and RAG. Open source SDK meilisearch v1.52.4 ★ 60k A lightning-fast search engine API bringing AI-powered hybrid search to your sites and applications. Open source API llm-app v0.3.6 ★ 59k 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. Open source API milvus v3.0.3 ★ 46k Milvus is a high-performance, cloud-native vector database built for scalable vector ANN search Open source APISDK faiss v1.15.1 ★ 41k A library for efficient similarity search and clustering of dense vectors. Open source SDK quivr v1-final ★ 40k An open-source engine that turns continuous content streams into search and monitoring. Durable ingestion, hybrid search, alerts, and plugins for formats, models and business rules. Open source SDK surrealdb v3.2.5 ★ 33k A scalable, distributed, collaborative, document-graph database, for the realtime web Open source API onyx helm/onyx-0.9.21 ★ 33k Open Source AI Platform - AI Chat with advanced features that works with every LLM Open source API valkey 9.0.6 ★ 27k A flexible distributed key-value database that is optimized for caching and other realtime workloads. Open source API typesense v30.2 ★ 27k Open Source alternative to Algolia + Pinecone and an Easier-to-Use alternative to ElasticSearch ⚡ 🔍 ✨ Fast, typo tolerant, in-memory fuzzy Search Engine for building delightful search experiences Open source API kotaemon v0.12.0 ★ 26k An open-source RAG-based tool for chatting with your documents. Open source API RAG-Anything v1.4.3 ★ 24k "RAG-Anything: All-in-One RAG Framework" Open source SDK sentence-transformers v6.2.0 ★ 19k State-of-the-Art Embeddings, Retrieval, and Reranking Open source SDK neo4j 5.26.32 ★ 17k Graphs for Everyone Open source API weaviate v1.38.22 ★ 17k Weaviate is an open-source vector database that stores both objects and vectors, allowing for the combination of vector search with structured filtering with the fault tolerance and scalability of a cloud-native database. Open source APISDK tantivy 0.26.2 ★ 16k Tantivy is a full-text search engine library inspired by Apache Lucene and written in Rust Open source SDK annoy v1.17.3 ★ 14k Approximate Nearest Neighbors in C++/Python optimized for memory usage and loading/saving to disk Open source SDK txtai v9.14.0 ★ 13k 💡 All-in-one AI framework for semantic search, LLM orchestration and language model workflows Open source SDKAPI lancedb v0.40.0 ★ 12k Developer-friendly OSS embedded retrieval library for multimodal AI. Search More; Manage Less. Open source SDK paradedb v0.26.1 ★ 9.4k One Postgres for your application data, full-text search, vector retrieval, and aggregations. Home of the pg_search extension. Open source SQL deeplake v4.5.2 ★ 9.3k Deeplake is AI Data Runtime for Agents. It provides serverless postgres with a multimodal datalake, enabling scalable retrieval and training. Open source SDK GPTCache 0.1.44 ★ 8.2k Semantic cache for LLMs. Fully integrated with LangChain and llama_index. Open source SDK sqlite-vec v0.1.9 ★ 8.2k A vector search SQLite extension that runs anywhere! Open source SQL FalkorDB v6.0.2 ★ 8.2k A super fast Graph Database uses GraphBLAS under the hood for its sparse adjacency matrix graph representation. Our goal is to provide the best Knowledge Graph for LLM (GraphRAG). Open source API R2R v3.6.5 ★ 8.0k SoTA production-ready AI retrieval system. Agentic Retrieval-Augmented Generation (RAG) with a RESTful API. Open source API vespa v8.763.13 ★ 7.1k The AI search platform Open source API hnswlib v0.9.0 ★ 5.3k Header-only C++/python library for fast approximate nearest neighbors Open source SDK marqo 2.26.0 ★ 5.0k Ecommerce Search and Discovery - marqo.ai Open source API chonkie v1.7.0 ★ 4.8k 🦛 CHONK docs with Chonkie ✨ — The lightweight ingestion library for fast, efficient and robust RAG pipelines Open source SDK infinity v0.7.4 ★ 4.7k The AI-native database built for LLM applications, providing incredibly fast hybrid search of dense vector, sparse vector, tensor (multi-vector), and full-text. Open source API memgraph v3.13.2 ★ 4.6k High-performance open-source in-memory graph database for GraphRAG, AI memory, agentic AI, and real-time graph analytics. Cypher-compatible, built in C++. Open source API USearch v2.26.4 ★ 4.3k Fast Open-Source Search & Clustering engine × for Vectors & Arbitrary Objects × in C++, C, Python, JavaScript, Rust, Java, Objective-C, Swift, C#, GoLang, and Wolfram 🔍 Open source SDK HippoRAG v1.0.0 ★ 4.0k [NeurIPS'24] HippoRAG is a novel RAG framework inspired by human long-term memory that enables LLMs to continuously integrate knowledge across external documents. RAG + Knowledge Graphs + Personalized PageRank. Open source SDK nano-graphrag v0.0.8 ★ 4.0k A simple, easy-to-hack GraphRAG implementation Open source SDK ColBERT v0.2.22 ★ 3.9k ColBERT: state-of-the-art neural search (SIGIR'20, TACL'21, NeurIPS'21, NAACL'22, CIKM'22, ACL'23, EMNLP'23) Open source SDK pgvectorscale 0.9.1 ★ 3.1k Postgres extension for vector search (DiskANN), complements pgvector for performance and scale. Postgres OSS licensed. Open source SQL infinity 0.0.78 ★ 3.0k Infinity is a high-throughput, low-latency serving engine for text-embeddings, reranking models, clip, clap and colpali Open source API colpali v0.3.18 ★ 2.8k The code used to train and run inference with the ColVision models, e.g. ColPali, ColQwen2, and ColSmol. Open source SDK kernel-memory packages-0.98.250508.3 ★ 2.2k Research project. A Memory solution for users, teams, and applications. Open source API VectorChord 1.1.1 ★ 1.8k Scalable, fast, and disk-friendly vector search in Postgres, the successor of pgvecto.rs. Open source SQL EmbeddingGemma 2 Google DeepMind's 0.74B multimodal embedding model: text (incl. code), images, video and audio in one 768-d space; 100+ languages, 8K context, Matryoshka truncation to 128/256/512; text-only loads just 270M, built for on-device RAG and semantic search Open source You.com Now focused on web search APIs for AI applications (pivoted from consumer AI search). Closed / commercial Paid API elasticsearch v9.5.5 ★ 78k Free and Open Source, Distributed, RESTful Search Engine Open source API redis 8.12-m02-int ★ 77k For developers, who are building real-time data-driven applications, Redis is the preferred, fastest, and most feature-rich cache, data structure server, and document and vector query engine. Open source API OpenSearch 3.9.0 ★ 14k 🔎 Open source distributed and RESTful search engine. Open source API
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- Default order is “recommended”: editorial picks first, then by popularity; general-purpose developer software and archived projects are listed last.
- Data checked 2026-10-22. Official links only. JSON API