Gemini is awesome
Need to clean up that hard drive? Chances are you have multiple copies of files. Gemini finds them and lets you delete them from inside the app, which means you can get more room on your drive.
Coda
I have been using this program for a couple of years. It works great. You should give it a try if you write code for the web.
App Zapper
This is a very handy program that I use all the time. It gets rid of all auxiliary files associated with applications you want to delete. AppZapper