Database

MySQL
http://www.mysql.com/

Toad for MySQL
http://www.quest.com/toad-for-mysql/

SQL Developer
http://www.oracle.com/technology/products/database/sql_developer/index.html

JDeveloper
http://www.oracle.com/technology/products/jdev/index.html

P6Spy
http://www.p6spy.com/documentation/install.htm