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.

A lightning-fast search engine API bringing AI-powered hybrid search to your sites and applications.

Milvus — a leading open-source project in the AI/LLM ecosystem.

A modern replacement for Redis and Memcached

Qdrant — a leading open-source project in the AI/LLM ecosystem.

Open Source AI Platform - AI Chat with advanced features that works with every LLM

Improve your resumes with Resume Matcher. Get insights, keyword suggestions and tune your resumes to job descriptions.

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

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​.

Knowledge Engine for AI Agent Memory in 6 lines of code

LLM-powered framework for deep document understanding, semantic retrieval, and context-aware answers using RAG paradigm.

LangChain4j is an open-source Java library that simplifies the integration of LLMs into Java applications through a unified API, providing access to popular LLMs and vector databases. It makes implementing RAG, tool calling (including support for MCP), and agents easy. LangChain4j integrates seamlessly with various enterprise Java frameworks.

Refine high-quality datasets and visual AI models

🌌 A complete search engine and RAG pipeline in your browser, server or edge network with support for full-text, vector, and hybrid search in less than 2kb.

The Fastest Distributed Database for Transactional, Analytical, and AI Workloads.

Developer-friendly OSS embedded retrieval library for multimodal AI. Search More; Manage Less.

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

Data Agent Ready Warehouse : One for Analytics, Search, AI, Python Sandbox. — rebuilt from scratch. Unified architecture on your S3.

Database for AI. Store Vectors, Images, Texts, Videos, etc. Use with LLMs/LangChain. Store, query, version, & visualize any AI data. Stream data in real-time to PyTorch/TensorFlow. https://activeloop.ai

Private & local AI personal knowledge management app for high entropy people.

Semantic cache for LLMs. Fully integrated with LangChain and llama_index.

Open Source Deep Research Alternative to Reason and Search on Private Data. Written in Python.

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.

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

Postgres with GPUs for ML/AI apps.

A query and indexing engine for Redis, providing secondary indexing, full-text search, vector similarity search and aggregations.

Code search MCP for Claude Code. Make entire codebase the context for any coding agent.

Open-source framework for building AI-powered apps in JavaScript, Go, and Python, built and used in production by Google

Open-source framework for building AI-powered apps in JavaScript, Go, and Python, built and used in production by Google

Superduper: End-to-end framework for building custom AI applications and agents.

MineContext is your proactive context-aware AI partner（Context-Engineering+ChatGPT Pulse）

A distributed approximate nearest neighborhood search (ANN) library which provides a high quality vector index build, search and distributed online serving toolkits for large scale vector search scenario.

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

CrateDB is a distributed and scalable SQL database for storing and analyzing massive amounts of data in near real-time, even with complex queries. It is PostgreSQL-compatible, and based on Lucene.

HelixDB is an open-source graph-vector database built from scratch in Rust.

Fast Open-Source Search & Clustering engine × for Vectors & Arbitrary Objects × in C++, C, Python, JavaScript, Rust, Java, Objective-C, Swift, C#, GoLang, and Wolfram 🔍

ACID Document Database

OP Vault ChatGPT: Give ChatGPT long-term memory using the OP Stack (OpenAI + Pinecone Vector Database). Upload your own custom knowledge base files (PDF, txt, epub, etc) using a simple React frontend.

Open-source tools for prompt testing and experimentation, with support for both LLMs (e.g. OpenAI, LLaMA) and vector databases (e.g. Chroma, Weaviate, LanceDB).

🧠 AI-powered enterprise search engine 🔎

🚀 efficient approximate nearest neighbor search algorithm collections library written in Rust 🦀 .