Vector Database GitHub Repositories (2026) · Open Source Tools

Knowhere extracts, parses, and outputs structured chunks ready for AI Agents and RAG.

Nearest Neighbor Search with Neighborhood Graph and Tree for High-dimensional Data

Infinispan is an open source data grid platform and highly scalable NoSQL cloud data store.

Nornicdb is a distributed low-latency, Graph+Vector, Temporal MVCC with all sub-ms HNSW search, graph traversal, and writes. Using Neo4j Bolt/Cypher and qdrant's gRPC means you can switch with no changes while adding intelligent features like schemas, managed embeddings, reranking+llm, GPU accel, Auto-TLP, Policy-based Memory Decay, and MCP server.

C# .NET NOSQL ( key value, object store embedded TextSearch SemanticSearch Vector layer ) ACID multi-paradigm database management system.

Vector search engine inside Milvus, integrating FAISS, HNSW, DiskANN.

.NET client for Meilisearch

Long-term memory for any AI agent. One Rust binary, offline, 98.2% recall@5 on LongMemEval-S. Self-host free or use Uteke Cloud.

Agent skills for Qdrant vector search: scaling, performance optimization, search quality, monitoring, deployment, model migration, version upgrades, and SDK usage across Python, TypeScript, Rust, Go, .NET, Java

The Kubernetes operator for K8ssandra

LLPhant - A comprehensive PHP Generative AI Framework using OpenAI GPT 4. Inspired by Langchain

A Blazor Web App and Minimal API for performing RAG (Retrieval Augmented Generation) and vector search using the native VECTOR type in Azure SQL Database and Azure OpenAI.

Official repository of the Seismic library.

The Kubernetes Operator of Milvus.

VTS is a tool designed for the transformation and transportation of vectors and unstructured data.

Self improving agents through iterations

A cognition aware database engine for AI agent memory. Purpose built in Rust with WAL, HNSW, knowledge graphs, and speculative context pre assembly. Not a wrapper, a ground up storage engine that thinks.

The AI-native database built for LLM applications, providing incredibly fast hybrid search of dense vector, sparse vector, tensor (multi-vector), and full-text.

.NET client for Chroma and Chroma Cloud, tested with Chroma 0.4.10 to 1.5.9.

Suite of tools containing an in-memory vector datastore and AI proxy