Mac users are lucky: Apple’s computers don’t need PC-like constant under-the-hood maintenance. That said, there is some value in occasionally tuning up your machine. That’s where Titanium’s OnyX (Free) comes into play. It’s been around since Mac OS X 10.2, and was just updated for Lion, so it’s ready to clean up your machine.
Every time you load OnyX, it’ll start with a startup disk scan and S.M.A.R.T. status verification. From there, you can set it to do all sorts of clean up work: delete caches, verify and repair system file permissions, and more. When you’re done, your system will likely run faster, and have at least a little extra hard disk space. It’s a great way to give your machine a little boost if it’s ever running a bit slower than you’d like; at least one of our editors considers it an absolute essential app for Mac users.