MySQL

MySQL AB develops, markets and supports the MySQL database server, the World's most popular Open Source database. With an estimated four million installations and up to 27,000 MySQL downloads per day, MySQL is the de facto Open Source database leader and is quickly becoming the core of many high-volume, business-critical applications. Major corporations such as Yahoo!, Sony Pictures Digital Entertainment, Motorola, NASA, Silicon Graphics, HP and Texas Instruments rely on the high performance MySQL database. Please, visit, http://www.mysql.com