#vector-database

MariaDB/server

C++

90

health

MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.

doobidoo/mcp-memory-service

Python

90

health

Open-source persistent memory for AI agent pipelines (LangGraph, CrewAI, AutoGen) and Claude. REST API + knowledge graph + autonomous consolidation.

alibaba/zvec

C++

89

health

A lightweight, lightning-fast, in-process vector database

christopherkarani/Wax

Swift

89

health

Single-file memory layer for AI agents, sub mili-second RAG on Apple Silicon. Metal Optimized On-Device. No Server. No API. One File. Pure Swift

topoteretes/cognee

Python

89

health

Memory control plane for AI Agents in 6 lines of code

weaviate/weaviate

Go

88

health

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​.

vespa-engine/vespa

Java

88

health

AI + Data, online. https://vespa.ai

langchain4j/langchain4j

Java

88

health

LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It integrates seamlessly with enterprise Java frameworks like Quarkus and Spring Boot.