File Compression

p7zip
7-zip(Free)
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How to Install 7-Zip on a Mac
SimplyRAR
Refelections VM(Free)
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A Look At SimplyRAR
StuffIt Deluxe
Smith Micro(Trial version)
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StuffIt Deluxe for Your Stuff
Express Zip Mac Compression Software
NCH Software(Trial version)
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Express Zip Mac Compression Software
Stuffit Expander
Smith Micro(Free)
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Stuffit Expander Explained
Flash Optimizer
Eltima Software(Trial version)
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Reduce compression time for SWF files without losing quality
Archiver
Dare to be Creative Ltd.(Trial version)
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Archiver: Easy to use compressor, archiver and splitter
Smart Zipper Pro
EffectMatrix(Trial version)
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Smart Zipper Pro for Mac - Efficient File Compression Software
YemuZip
Yellow Mug Software(Free)
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A free program for Mac, by Yellow Mug Software.
BetterZip
Macitbetter(Trial version)
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BetterZip: Compress zip and tar archives