MySQL Server

MySQL is a multithreaded, multi-user SQL database management system (DBMS) which has, according to MySQL AB, more than 10 million installations. The basic program runs as a server providing multi-user access to a number of databases.

In a similar fashion to the JBoss model, MySQL is owned and sponsored by a single for-profit firm, the Swedish company MySQL AB, which holds the copyright to most of the codebase. The project's source code is available under terms of the GNU General Public License, as well as under a variety of proprietary agreements.

Find out a lot more at http://mysql.com/