OnyX is a multifunctional utility for Mac OS X. It allows you to verify the startup disk and the structure of its System files, to run miscellaneous tasks of system maintenance, to configure the hidden parameters of the Finder, Dock, Spotlight, and of some of Apple's own applications, to delete caches, to remove a certain number of files and folders that may become cumbersome and more.
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17.1 MB
It would be fine, if the updater (mac.informer) verifies the current OS-version before propose the update. Otherwise you have to expect many problems to remove the unmatched version and reinstall the old but working one.
Don't simply rely on download sites (MacUpdate, etc.). If you go to the developers site, they have versions of Onyx available for old versions of OS X as well as M/L. They say they're soon to release the Mavericks version as well.
For Mountain Lion only! Does not work with Lion.