MariaDB
When Oracle took over MySQL, there was concern about whether Oracle would continue to keep MySQL open source, so a group of developers created MariaDB, which is based on MySQL and published under the GNU public license. MariaDB isn’t just a mirror image of MySQL, however. Developers are continually striving to build close-sourced features of the MySQL commercial edition into MariaDB, and to improve some of MySQL’s features. And, in our tests, MariaDB performed slightly faster than MySQL.
