BetterZip lets you quickly view the contents of an archive in a Finder like list view without extracting it. It lets you add files to archives and extract single files from archives.
BetterZip can extract and create fully WinZip compatible AES-256 encrypted zip files. It handles zip, sit, rar, 7-zip, tar, dd, bin, hqx, tgz, tbz2, gzip, bzip2, arj, lha/lzh, cab, iso, chm, rpm, deb, nsis, and cpio archives.
The preview drawer lets you quickly view images, PDF, HTML, RTF, and text files.