iZip is a FREE powerful archiving utility designed specifically for Mac.
iZip is the easiest way to manage .ZIP, .ZIPX and .RAR archives on your Mac, and best of all it's completely free! When you open an archive with iZip it appears as a removable disk. This allows management of your files right inside the OS X Finder, all view modes including cover-flow just work. For extra security iZip supports up to 256 bit AES zip encryption.