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What are some “must have” Mac OS X programs?

What are some tools you use a lot to diagnose and fix Macs?

I'll start the ball rolling

Temperature Monitor

Quick and easy tool for finding out the temperature of various components. Apple put lots of sensors inside so it's quite informative

JDiskReport

A Mac equivalent of Treesize. Not as good as Treesize but does the job eventually.

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marked as duplicate by random Aug 9 '10 at 13:29

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3 Answers

Cocktail
The best multipurpose tool I've used.

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DiskWarrior is also a good tool for HDD recovery.

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