Open Source for Mac OS X

BetterZip lets you quickly inspect an archive without first extracting its contents. You can add or extract files via drag-and-drop or delete files from archives. With the click of a button BetterZip can strip Mac specific files and folders, e.g., resource forks or Finder settings, from zip files and tar balls for best compatibility with Windows or Linux systems.

 BetterZip handles archives with these formats: zip, sit, tar, gzip, bzip2, rar, 7-zip, BinHex, MacBinary, cpio, arj, lzh/lha, cab, iso, chm, and a few more. BetterZip lets you quickly preview images, PDF, HTML, and text files in a drawer without the need for starting external programs.