Zipeg is an ultimate tool for opening ZIP and RAR files on Mac and Windows. (think of it as a free little brother of WinZip, WinRar', StuffIt family). Project has been abandoned.
Zipeg is the easiest way to open RAR or ZIP archive, find the right file inside archive and unpack it. Zip thru photo archives, see thumbnails, select and extract what you need.
Zipeg supports:
Formats: ZIP, RAR, 7z, ARJ, LHA, TGZ, TAR and many many more.
Pictures and Photos - preview them instantly or open in external application.
Filenames in your national alphabet.
Windows: XP and Vista, Mac OS X: Tiger and Leopard.
7-Zip is a file archiver featuring a high compression ratio to extract or create compressed files in multiple formats. 7-Zip is free, open-source software with open source under the GNU LGPL license. Portable version is also available.
PeaZip is an Open Source file manager or file archiver that can open all popular compression types (over 200), including ZIP, ZIPX, RAR, 7Z, DMG, ACE, CAB, TAR, and ISO.
WinZip brings the convenience of Windows to Zip files and other compression formats making it a snap to zip/unzip files for fast, efficient, and secure uploading/downloading, emailing, and storage.