SQuirrel SQL client for Ubuntu

Provides a nice gui for accessing Microsoft SQLServer databases. (Handles MySQL also.)

Get it from here: http://www.squirrelsql.org/

Configuring it is a little tricky...use the guide here:
http://informatics.malariagen.net/2011/08/15/squirrel-sql-a-nice-database-gui-frontend-for-ubuntu/

To configure it for MySQL as well, follow similar steps after installing the mysql-jdbc driver.
sudo apt-get install libmysql-java