A command line port of the 7zip utility to Unix, Mac OS X and BeOS.

Quantization, Compression, and Coding Library. C source code freely available.

Open source Windows utility for manipulating archives. Formats 7z, ZIP, GZIP, BZIP2 and TAR are supported fully, other formats can be unpacked.

Delivers cross-platform data compression for data transfer, archiving, and retrieval.Part of the CoSORT family of sort and data manipulation solutions.

Compression for Lotus Notes, that automatically compresses attached files into ZIP files or self-extracting files. Features full integration with the Lotus Notes email client software.

Takes all the ZIP archives from one directory and extracts them to another one, allows you to handle more than one ZIP archive at once. Free open-source software for Win32.

Offers downloads, support forums and registration for RAR compression tools.

High performance lossless image compression applications, utilities and libraries.

Shareware utility. When compared to WinZip the most important advantage of WinAce is better compression.

A massively spiffy yet delicately unobtrusive compression library.