MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
Qizx - XML Databases
MySQL - The world's most popular open source database
BaseX - BaseX is a very light-weight, high-performance and scalable XML Database engine and XPath/XQuery...
Microsoft SQL - Microsoft SQL is a best in class relational database management software that facilitates the database server to provide you a primary function to store and retrieve data.