MySQL

MySQL (pronounced (IPA) , "my S-Q-L") 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 multiuser access to a number of databases.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. This is similar to the JBoss model. It is dissimilar to the Apache project, where the software is developed by a public community and the copyright to the codebase is owned by its individual authors.
See more at Wikipedia.org...