PostgreSQL is a powerful, open source object-relational database system.

The world's most popular open source database

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Microsoft Azure is an open, flexible, enterprise-grade cloud computing platform. Move faster, do more, and save money with IaaS + PaaS. Try for FREE.

MongoDB (from "humongous") is a scalable, high-performance, open source NoSQL database.

An enhanced, drop-in replacement for MySQL

HTTP + JSON document database with Map Reduce views and peer-based replication

Discover the world's #1 database and cloud database management products and solutions including the self-driving and fully automated Autonomous Database Cloud 18c.

Redis

The open-source database for the realtime web

A distributed open-source database with a flexible data model for documents, graphs, and key-values.

MySQL :: MySQL Community Edition