Mac users interested in Disk diet for leopard generally download:
CleanMyMac provides you with multiple features for improving the performance of your system. The application was designed so that any user, no matter his or her level of computer experience, can easily configure the program's settings and use the built-in tools efficiently.
Disk Diet is a Mac program that enables you to reclaim space on your drive with just a few clicks. This utility comes in handy if you're dealing with low disk space and wish to immediately find and remove the files and applications you no longer use or need on your Mac.