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The Unarchiver is great. It is promoted as "a much more capable replacement for 'Archive Utility.app', the built-in archive unpacker program on Mac OS X"
 
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I hate RAR with a passion but sometimes you've got to open one. I too like The Unarchiver. It handles all sorts of things, so you don't need a separate RAR opener, another one for 7zip, it can open my legacy Amiga LHA files, etc.
 
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