Apache Arrow

AnythingLLM is an open-source, self-hosted AI application with integrated vector storage and retrieval for embeddings, enabling RAG and LLM workflows. Key features include built-in RAG, AI agent support, Docker deployment, and free MIT license. Ideal for RAG prototypes and local deployments, providing cost savings and full control compared to managed services like Pinecone.

Awesome-Moviate is an open-source, self-hosted demo for hybrid vector search using Weaviate, combining BM25 and semantic search for movie recommendations. Key features include Docker deployment, hybrid retrieval pipeline, and free open-source code. Ideal for RAG-like prototypes in media retrieval, self-hosted for cost-effective experimentation vs managed vector DBs like Pinecone.

Bleve is an open-source, self-hosted full-text search and indexing library in Go with experimental vector search support for hybrid retrieval. Key features include full-text, numeric, geo-spatial indexing, flexible mappings, and free Apache 2.0 license. Suitable for RAG prototypes needing hybrid search, offering self-hosted cost savings vs managed services like Pinecone.

Crate is an open-source, self-hosted distributed SQL database with native vector data types and similarity search for AI applications. Key features include horizontal scaling, PostgreSQL compatibility, Lucene-based indexing, and Apache 2.0 license. Ideal for RAG and real-time analytics, providing free self-hosting vs managed vector DBs like Pinecone for cost control.

frugal is an open-source, self-hosted platform for AI/ML operations with vector database support, focusing on cost optimization and transparency. Key features include model-agnostic tracking, alerting, caching, and free use. Useful for RAG prototypes monitoring costs, self-hosted alternative to managed services like Pinecone for reduced expenses.

Havenask is an open-source, self-hosted distributed search engine from Alibaba with vector search for large-scale AI applications. Key features include high QPS/TPS, millisecond latency, SQL queries, and free use. Suited for production RAG and search, self-hosted for cost efficiency vs managed like Pinecone.