The Unarchiver is a free unarchiving application for Mac OS X, which can open most archives formats in use today, and many, many older ones. It also handles filename encodings for archives from different OSes and different countries. It is designed to be simple and unintrusive.
There is also early support for other OSes in the form of command-line tools that run on Linux and Windows, and provide most of the functionality of The Unarchiver on OS X, except for a GUI.
Supported formats include Zip, Tar, Gzip, Bzip2, 7-zip, RAR, LZH, StuffIt, StuffIt X, and a whole lot more.
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