This page has a good set of pointers to LHA programs and source code, including variants such as AR002, lz_comp2, and Lharc.

http://members.aol.com/DuckGroup/lha_comp.html

Links that mostly point to some papers and source code, concentrating on lossless LZ type compression.

http://www.cs.pdx.edu/~idr/compression/

Compression Engines, Inc. has a file format called WIF, which stands for Wavelet Image Format. They licensed it from HARC, and have created and ActiveX control, a browser plugin, a standalone program, and the requisite Photoshop plugin. Check it out.

http://www.cengines.com/

Zlibc emulates a compressed file system. This lets you keep all your executables compressed in one place, unzipping them on the fly as they are needed. Looks like it works with various Linux and UNIX type sytems, including Solaris. I’m guessing that it’s free, please correct me if I’m wrong.

http://zlibc.linux.lu/

These folks appear to be selling some lossless compression technology, but I’m not quite able to determine what it is.

http://www.compris.com/Densifier/en/

This company appears to be in the business of packaging demographic data for research and commercial interests. As part of that, they apparently have some technology for performing some compression on the data sets.

http://www.geolytics.com/customwork/compression.html

This site advertises a bunch of nifty looking codecs, including TELP, JPEG, Speech, MPEG, and wavelet compressors. I can’t quite determine exactly what form the products come in.

http://www.gt-tech.com/technology.html

These folks sell a couple of boxes that do MPEG-2 encoding. Looks like they are oriented towards the video broadcasting business.

http://www.tiernan.com/

Nuera makes a couple of speech multiplexers that use CELP compression. You probably won’t be interested in these unless you’ve got a T1 line that is bursting at the seams.

http://www.nuera.com/products/AP200_100.cfm

Vladimir has pointers to a batch of his papers here, which seem to concentrate on image compression, including VQ and Wavelet based compression. Plus many links to image compression, fractal, and wavelet pages.

http://www.cse.sc.edu/~culik/valenta/

A course being given by the Image Coding Group at Linköping University. Contains a few useful links plus some course material.

http://www.icg.isy.liu.se/courses/tsbk01/

A paper by D.J. Craft discussing findings from some research on lossless compression algorithm.s

http://www.research.ibm.com/journal/rd/426/craft.html

A paper from the IBM R&D group discussing the use of lossless compression in hardware.

http://www.research.ibm.com/journal/rd/426/burroughs.html

A paper describing the creation of a compression engine that was later implemented in firmware.

http://www.research.ibm.com/journal/rd/426/marks.html

This IBM research paper looks into the performance of compressors in relation to the compressibility of the the objects they are compressing. At least I think that’s what it is talkinga bout.

http://www.research.ibm.com/journal/rd/426/kampf.html

Home page for DC Micro, home of Crusher!, the data compression toolkit

http://www.dcmicro.com/

IBM’s implementation of arithmetic coding known as the Q-coder is a well-known piece of work. (Patented, unfortunately.) This paper discusses an implementation of the Q coder in hardware.

http://www.research.ibm.com/journal/rd/426/mitchell.html

An IBM research paper. The title pretty much says it all.

http://www.research.ibm.com/journal/rd/426/anderson.html

This issue of the IBM Journal is packed full of articles about MPEG-2.

http://www.research.ibm.com/journal/rd43-4.html

All of the papers from the 1999 Data Compression Conference are available here on line. Yes, there is a catch - you will have to pay if you want to do more than read the abstract. (Looks like a strong incentive to become a member of the IEEE Computer Society.)

http://www.computer.org/proceedings/dcc/0096/0096toc.htm

All of the papers from the 2000 Data Compression Conference are available here on line.

http://www.computer.org/proceedings/dcc/0592/0592toc.htm

All of the papers from the 1997 Data Compression Conference are available here on line.

http://www.computer.org/proceedings/dcc/7761/7761toc.htm

Home page for the book: Introduction to
Information Theory and Data Compression
Darrel Hankerson, Greg A. Harris, and Peter D. Johnson Jr.

http://www.dms.auburn.edu/compression/index.html

All of the papers from the 1998 Data Compression Conference are available here on line.

http://www.computer.org/proceedings/dcc/8406/8406toc.htm

Links to code and papers by Radford Neal and pals.

http://www.cs.toronto.edu/~radford/ac.software.html

Radford Neal is a professor at the University of Toronto. One of his research interests is data compression, and his name appears on a couple of seminal papers on arithmetic coding. Links to papers can be found here.

http://www.cs.utoronto.ca/~radford/

The home page for Robert Jung and ARJ. This page has links to the ARJ FAQ, downloads of the various ARJ executables, and ordering information. It also is the home page for the newer JAR archiver. Arj is now on release 2.71.

http://www.arjsoft.com

Alex has collected a series of newsgroup discussions on Huffman coding.

http://alexvn.freeservers.com/s1/alexvn.html

Some C++ template code implementing a Huffman algorithm by Alex Vinokur.

http://alexvn.freeservers.com/s1/huffman_template_algorithm.html

This site appears to have a massive number of links to the current versions of RAR. The entire site is written in Dutch.

http://user.online.be/~hdesmet/rar/