Best software for performing file comparisons between 2 different folder locations within Mac OS X

What are the best software programs for performing file comparisons between 2 different folder locations within a Mac OS X computer?

I need to find out which files and folders exist in one location that don't exist in the other location and if there are any differences between the files within the two folder locations.
IT GuyNetwork EngineerAsked:
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nappy_dThere are a 1000 ways to skin the technology cat.Commented:
Take a look at these options:

FreeFileSync

MeldMerge

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Jesse BruffettM&F-ing SorcererCommented:
open terminal and use "diff"
hulseboschSystem administratorCommented:
Total commander
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