Compression software and tools for geographic data, document management, and web distribution.

Algorithms, links, comparisons, conferences, corpora and the home of the compressor ABC.

Windows and Mac data compression utility that supports zip, TAR, gzip, BinHex, and MIME. ARJ, LZH, and ARC formats. Includes ZipSend file delivery web service and ZipShare Facebook app.

Makers of Zip and Unzip data compression controls for Windows developers that use ActiveX, OCX, VBX and DLLs.

A set of benchmarks designed to show the state of the art in lossless data compression, by Jeff Gilchrist.