Drizzle is a Free Software/Open Source database management system (DBMS) that was forked from version 6.0 of the MySQL DBMS. Like MySQL, Drizzle has a client/server architecture and uses SQL as its primary command language. Drizzle is distributed under version 2 of the GNU General Public License. More here
Drizzle is written in the C++ programming language, and stores its string data in an UTF-8 format. It is being developed for modern Unix-like operating systems, including Linux, Mac OS X, and Solaris – in general, any OS that conforms to POSIX.