Database Systems

ClickHouse® is a real-time analytics database management system

Distributed search and analytics engine with an open-source core and additional license options.

YTsaurus is a scalable and fault-tolerant open-source big data platform.

Turso is an in-process SQL database, compatible with SQLite.

DuckDB is an analytical in-process SQL database management system

A portable accelerated SQL query, search, and LLM-inference engine, written in Rust, for data-grounded AI apps and agents.

Harper is an open-source Node.js performance platform that unifies database, cache, application, and messaging layers into one in-memory process.

Milvus is a high-performance, cloud-native vector database built for scalable vector ANN search

Simple, Elastic-quality search for Postgres

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

A flexible distributed key-value database that is optimized for caching and other realtime workloads.

YDB is an open source Distributed SQL Database that combines high availability and scalability with strong consistency and ACID transactions

TypeScript implementation of the DXOS protocols, SDK, toolchain and Composer.

LadybugDB a graph database

SIMD-accelerated columnar database for analytics.

Development at the speed of light

High-performance, scalable time-series database designed for Industrial IoT (IIoT) scenarios

ArcadeDB Multi-Model Database, one DBMS that supports SQL, Cypher, Gremlin, HTTP/JSON, MongoDB and Redis. ArcadeDB is a conceptual fork of OrientDB, the first Multi-Model DBMS. ArcadeDB supports Vector Embeddings.

The First Distributed Real-Time Search Analytics Database

Distributed reliable key-value store for the most critical data of a distributed system

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/

A modern replacement for Redis and Memcached

The world's fastest open query engine for sub-second analytics both on and off the data lakehouse. With the flexibility to support nearly any scenario, StarRocks provides best-in-class performance for multi-dimensional analytics, real-time analytics, and ad-hoc queries. A Linux Foundation project.

Event streaming platform for agentic AI. Continuously ingest, transform, and serve event streams in real time, at scale.

Community-developed open-source relational database server derived from MySQL.

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.

SDK that enables local-first and real-time reactive apps with embedded SQLite for JavaScript clients, including React Native and Web

🔎 Open source distributed and RESTful search engine.

Official repository of Trino, the distributed SQL query engine for big data, formerly known as PrestoSQL (https://trino.io)

An immutable SQL database for application development, time-travel reporting and data compliance. Developed by @juxt

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

TiDB is built for agentic workloads that grow unpredictably, with ACID guarantees and native support for transactions, analytics, and vector search. No data silos. No noisy neighbors. No infrastructure ceiling.

A fast, local first, reactive Database for JavaScript Applications https://rxdb.info/

Graph database platform

HelixDB is an OLTP graph-vector database built in Rust.

Search engine and full-text search database.

QuestDB is a high performance, open-source, time-series database

🦔 Fast, lightweight & schema-less search backend. An alternative to Elasticsearch that runs on a few MBs of RAM.

Open source, cloud native, Postgres platform with copy-on-write branching and scale-to-zero

Durable Streams API

TerminusDB is a distributed, collaborative database designed for building, sharing, versioning, and reasoning on structured data.

Embeddable Postgres with real-time, reactive bindings.

Embedded SQL database engine distributed as public-domain source.

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

Read-path sync engine for Postgres that handles partial replication, data delivery and fan-out.

Data API builder provides modern REST, GraphQL endpoints and MCP tools to your Azure Databases and on-prem stores.

Open-source relational database server and MySQL Cluster codebase.

Cognitive memory database for AI agents — consolidates duplicates, detects contradictions, fades stale memories via temporal decay. Rust, AGPL, ships as library / MCP server / HTTP cluster.

Graph database optimized for fast analysis and real-time data processing. It is provided as an extension to PostgreSQL.

Scalable datastore for metrics, events, and real-time analytics

A distributed SQLite server with MySQL wire compatible interface

A cloud-native open source distributed time series database with high performance, high compression ratio and high availability.

Backend server with REST APIs for core backend needs.

Cloud native full text search

Open-source machine learning database for consistent features across training and inference.

PostgreSQL reengineered for multi-tenant apps

Serverless Postgres database

Serverless MySQL platform

Epsilla is a high performance Vector Database Management System

Collection of open source databases built on a common storage foundation.

Embedded SQL OLAP in C++. Live views that re-parse only the bytes your CSVs grew by. Reads Parquet/CSV/JSON/Avro/Arrow/SQLite natively. 3.9× DuckDB on a 5-query warm batch. MIT.