Billings
Create and send invoices and perform other billing functions
http://www.marketcircle.com/billings/
Sequel Pro
Sequel Pro is a fast, easy-to-use Mac database management application for working with MySQL databases
http://www.sequelpro.com/
LittleSnapper
LittleSnapper is a screenshot and website capturing application for Mac OS X that lets you easily capture, organise, annotate and share webpages
http://www.realmacsoftware.com/littlesnapper/
MAMP
Install Apache, PHP and MySQL with few clicks under Mac OS X!
www.mamp.info/
Cornerstone
Cornerstone, the Subversion (svn) client for Mac OS X.
www.zennaware.com
Coda, Chrome, Dropbox, Firefox with Firebug...
thats kinda it...
