CORE group just released newest updated version of Rucksack – simple to use compressing and decompressing tool for OSX platform.
Description: Rucksack is a must-have tool for anyone working with archives. Open all popular archive formats including RAR, StuffIt, 7zip, and of course Zip. Safely backup your files with Rucksack’s built-in encryption support. And convert easily between archive formats, such as from RAR to Zip.