AppleJack

Troubleshoot a Mac even if you can’t load the GUI, or don’t have a startup CD handy. Repair your disk, repair permissions, validate the system’s preference files, and get rid of possibly corrupted cache files.

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AppTrap

When you move an app to the trash, you get a notice listing its associated files and asking whether you want to delete them as well. It could be the most efficient way of all to delete programs.

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DasBoot

Turn your iPod into a recovery and diagnostic tool.

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Mac HelpMate

A good all-round utility that cleans, maintains and helps with troubleshooting.

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MacJanitor

There’s maintenance stuff your Unix-based computer does every night, but if you’re like me and turn it off at night, that won’t happen. So get MacJanitor to do it instead, and keep that Mac purring.

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Onyx

Verifies the startup disk and the structure of its system files, runs system maintenance, configures some hidden parameters , deletes caches, removes unneeded files and folders, and more.

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Purity

Go through caches, logs, browsers, downloads, chats and games — check off the cruft you don’t want — then click to move it into the trash. A great way to clean up your Mac. Ignore the Buy button. Purity is now freeware.

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SMARTReporter

Warns you of some ATA hard disk failures before they happen by periodically polling the S.M.A.R.T.-status of your hard disk.

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Utilities
freeware

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