winzip rar

Accepts a directory as input and will repair/verify any PAR/PAR2/SFV/MD5 files.

Restore WinRAR file passwords fast

Rar / Unrar .NET component for C#, VB.NET, and ASP.NET

jZip supports ZIP, RAR, TAR, ISO and more. jZip is a free alterative for WinZip.

Password recovery tool for pkzip/WinZip

Recovers data from corrupted damaged ZIP files created using WinZip, WinRar

Password recovery tool for pkzip/WinZip

fastest password recovery tool for Zip/WinZip/pkzip archives

ZipItFree is like WinZip, except free & better. Compress even more now.

CRC32 Source is the official CRC-32 algorithm used in PKZip, WinZip and Ethernet