Data Compression

QuikCAT Technologies - Specializing in data compression software technologies for wireless transmission, Internet acceleration, Microsoft Exchange and Lotus Notes E-mail acceleration, and PDA video conferencing, using cellular automata transforms.
http://www.quikcat.com

CAM Development - CAM UnZip - Free zip file utility, which allows you to quickly, open, create, and modify ZIP archives. In addition, CAM Unzip supports password protection, and can run an archive's Setup file automatically after it is unzipped.
http://www.camunzip.com

Xceed Software Inc. - Makers of Zip and Unzip data compression controls for Windows developers that use ActiveX, OCX, VBX and DLLs.
http://xceed.com

Rarissimo - Companion tool for WinRAR for preserving NTFS alternate streams.
http://peccatte.karefil.com/Software/Rarissimo/RarissimoEN.htm

CoffeeCup Free Zip Wizard - Free Zip/Unzip utility. CoffeeCup Free Zip Wizard has built-in E-mail and FTP functions, so you can Zip and send your files in one easy step.
http://www.coffeecup.com/zip-wizard/

SolutionSoft Systems, Inc. - E-Space, compression software for online archiving and disk space management.
http://www.solution-soft.com/

BitJazz Inc. - Lossless compression for photoquality images. Cross-platform. SDK. Free reader.
http://www.bitjazz.com

x-PRESS - Delivers cross-platform data compression for data transfer, archiving, and retrieval.Part of the CoSORT family of sort and data manipulation solutions.
http://www.iri.com/public/solutions/xpress/xpress.htm

ncompress - Free LZW file compressor mainly used for compressing and extracting tar.Z archives, released as source code. For UNIX systems.
http://ncompress.sourceforge.net/

RAR/WinRAR support site - A support site for RAR and WinRAR archivers.
http://www.rarlab.com

QccPack - Quantization, Compression, and Coding Library. C source code freely available.
http://qccpack.sourceforge.net/

ZipMail - 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.
http://www.notes-compression.com/

Automatic File Archiver by JSPayne - Does automatic archiving and backup of recently modified.
http://www.jspayne.com/filearchiver/

Zzip - A compression tool under GPL. Zzip compression algorithm is mainly based on the Burrows-Wheeler Transform method developed by Mike Burrows and David Wheeler.
http://debin.net/zzip/

RARReg - Offers downloads, support forums and registration for RAR compression tools.
http://www.rarreg.com/

1StepUnzip - Easy to use shareware tool for unzipping and installing your downloaded Internet files.
http://1stepunzip.com/

FilZip 2000 - Free application to handle a variety of archive file formats, including .ace, .arc. arj, .cab, .gz, .lha, .jar, .rar, .tar and of course .zip. (Win 9x/NT/2000/Me)
http://www.filzip.com/

Hifn Inc. - Designs, develops, and markets compression processors, encryption/compression processors, and software which provide alternatives for the implementation of high performance networks and tape storage devices. (Nasdaq: HIFN).
http://www.hifn.com/

USENET Compression FAQ - This URL takes you to a compression FAQ that explains compression to technical people as well as describing the various programs, and what they do to users.
http://www.faqs.org/faqs/compression-faq/

JET-Software - Software house in Germany, with compression products for mainframe, midrange and mini systems.
http://www.jet-software.com/

Smacker Video Technology - A compressor for video, animation and sound data includes video compression with twice the video quality and now uses the Bink audio codec for perceptually lossless 8 to 1 compression.
http://www.radgametools.com/smkmain.htm

GZIPSite Website Compression - Tool that can help you make static HTML websites run 50% faster and save 50-80% of the bandwidth.
http://www.applet.dk/

Maximum Compression - Aims to show the maximum achievable lossless data compression ratio for several filetypes (text, executable, bmp). The best 150+ programs for every filetype are shown in a table indicating compression ratio and switches/options used to achieve that compression.
http://www.maximumcompression.com/

WinAce - Shareware utility. When compared to WinZip the most important advantage of WinAce is better compression.
http://www.winace.com/

StuffIt - Create and access email attachments and downloads, protect data, and transfer files.
http://www.stuffit.com/

ZBit Inc. - COM objects to Zip and Unzip files.
http://www.zbitinc.com

P7ZIP - A command line port of the 7zip utility to Unix, Mac OS X and BeOS.
http://p7zip.sourceforge.net/

RICAZip - High performance lossless image compression applications, utilities and libraries.
http://www.ricazip.com/

zlib - A massively spiffy yet delicately unobtrusive compression library.
http://www.zlib.net

Video Compression Components - Third-party video compression software components for programmers.
http://www.imaging-components.com/

Info-ZIP - Free, portable compression and extraction utilities for archives compressed in .zip format. Discussion forum, source code, and binaries for several platforms.
http://www.info-zip.org/

Archive Comparison Test - A set of benchmarks designed to show the state of the art in lossless data compression, by Jeff Gilchrist.
http://www.compression.ca/

Zipsearch - Zipsearch is shareware to search compressed zip archives for files inside archives. The program finds text strings within the files for viewing and changes.
http://www.filehunter.com/ZipsearchDetails.htm

7-Zip - Open source Windows utility for manipulating archives. Formats 7z, ZIP, GZIP, BZIP2 and TAR are supported fully, other formats can be unpacked.
http://www.7-zip.org/