PostgreSQL

PostgreSQL is a powerful, open source object-relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness.

Free Open Source Mac OS X Windows Linux BSD

MongoDB

MongoDB (from "humongous") is a scalable, high-performance, open source NoSQL database. The database is document-oriented so it manages collections of JSON-like documents.

Free Open Source Mac OS X Windows Linux BSD Web

Microsoft SQL Server

SQL Server delivers on Microsoft’s Data Platform vision by helping your organization manage your data by enabling you to store data from structured, semi-structured, and unstructured documents within the database.

Freemium Windows

CouchDB

Apache CouchDB is a distributed, fault-tolerant and schema-free document-oriented database accessible via a RESTful HTTP / JSON API.

Free Open Source Mac OS X Windows Linux Android BSD

Oracle Database

Oracle Database delivers industry leading performance, scalability, security and reliability on a choice of clustered or single-servers running Windows, Linux, and UNIX.

Commercial Mac OS X Windows Linux

Amazon Relational Database Service

Amazon Relational Database Service is a web service that makes it easy to set up, operate, and scale a relational database in the cloud. As of July 2011 in public Beta.

Commercial Web

Clustrix

Clustrix is the leading scale-out SQL database engineered for the cloud. With Clustrix, you can scale transaction throughput, run real-time analytics, and simplify...

Commercial Web

Sybase Advantage Database Server

Advantage Database Server is a full-featured, easily embedded, client-server, relational database management system that provides you with Indexed Sequential Access...

Commercial Windows Linux

Heroku Postgres

A powerful, reliable, and durable open-source SQL-compliant database, PostgreSQL is the datastore of choice for serious applications. Now it is available in seconds with...

Commercial Web

SQL Azure

SQL Azure is a highly available and scalable cloud database service built on SQL Server technologies. With SQL Azure, developers do not have to install, setup or manage...

Commercial Web