Onyx and Cocktail are two well known and used applications to help Mac users clean out their system of log files, temp files, rebuild their spotlight indexes, run scheduled Mac scripts on demand, and so much more.

A new kid on the block is MainMenu by Santa Software, and it is really nice. It has a clean and simple interface yet manages to perform everything that I'm looking for in an application like this. This isn't something that I run every day, or even every week. I probably run this sort of utility every few months, but I like the fact that it is at my disposal and can make easy work of these duties. In fact it has got me to uninstall Onyx and run MainMenu instead.