MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
MySQL - The world's most popular open source database
Microsoft Office Access - Access is now much more than a way to create desktop databases. It’s an easy-to-use tool for quickly creating browser-based database applications.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
Microsoft SQL Server - Microsoft Azure is an open, flexible, enterprise-grade cloud computing platform. Move faster, do more, and save money with IaaS + PaaS. Try for FREE.
SQLite - SQLite Home Page