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

This question covers exactly the same ground as earlier questions on this topic; its answers may be merged with another identical question. See the FAQ for guidance on how to improve it.

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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