A Java program that prints javacode for coding and decoding the characters through a Huffman tree.

http://DataCompression.info/ArchiveFormats/HuffmanTool.txt

JPEG Cruncher is a commercial app that lets you squeeze the heck out of your images while keeping them looking as nice as possible.

http://www.spinwave.com/jc/

An explanation from Colin E. Manning, complete with pictures.

http://www.newmediarepublic.com/dvideo/compression/adv04.html

by Andrei Khodakovsky, Peter Schröder, Wim Sweldens. Compressing 3-D object representations is a good thing. Even better is allowing progressive display of these objects. The techniques in this paper are to be applied to geometric meshes.

http://cm.bell-labs.com/who/wim/index.html

A short paper discussing various preprocessing techniques that can be used in BWT-based compression programs. RTF format.

http://DataCompression.info/ArchiveFormats/BWT_paper.rtf

JJ2000 is a Java implementation of a JPEG 2000 codec. The web site states that JJ2000 is under consideration to be a reference implemenation of the standard. JJ2000 is now freely available to all, and may be freely used in products that implement JPEG 2000-Part I.

The page also includes links to a white paper, presentations, and other related web pages.

http://jj2000.epfl.ch/

Cybermail is a product that lets you compress video files for email transmission. According to the advert, they have a revolutionary new compression engine!,

http://www.comtrad.com/cfusion/template/makepage.cfm?prod_name=Video_Email&site=85124&bran
ch=unshocked&category=0&product_base_id=322&sourceid=002938462

Vigos makes software that lets you compress web pages before delivering them to your customers.

http://www.vigos.com

by Walter Korman. An introductory article with a very brief look at the field, along with some links.

http://www.go2net.com/internet/deep/1997/01/01/

An overview of Shannon Fano coding from the folks at the DataCompression Reference Center.
This link points to an archived site, as the original has disappeared. Links on the archived page may or may not work properly.

http://web.archive.org/web/20020618022412/http://www.rasip.fer.hr/research/compress/algori
thms/fund/sfc/

by Jack Ganssle. A quick look at lossless compression, including RLE, Huffman coding, and LZ techniques.

http://www.ganssle.com/articles/acompres.htm

A collection of class notes, homework assignments, and links for a class on Data Compression at the University of Minnesota.

http://www.ece.umn.edu/users/kieffer/ece5585.html

by George Buyanovsky. One of the only existing explanations of the mysterious ACB algorithm.

http://www.cs.pdx.edu/~idr/unbzip2.cgi?compression/acb_compress.html.bz2

A web page that provides an overview of lossless techniques.

http://www.vectorsite.net/ttdcmp1.html

CInfoZip by Alchemy Lab is an MFC class that makes it easy to add Zip support to your C++ programs written using Visual C++. Despite the fact that Alchemy Labs is a commercial operation, they’re giving this code away for free.

http://www.alchemy-lab.com/devcorner/infozip/

This page has links to a bunch of algorithm descriptions, courtesy of the Data Compression Reference Center.
This link points to an archived site, as the original has disappeared. Links on the archived page may or may not work properly.

http://web.archive.org/web/19990427033625/http://www.rasip.fer.hr/research/compress/algori
thms/index.html

A set of slides, maybe to accompany a lecture. Covers basic info theory and data compression.

http://www.ifi.uio.no/~ftp/publications/cand-scient-theses/SHuseby/html/node41.html

Another zip utility.

http://www.castillobueno.com/cczip.htm

A very gentle introduction to Shannon’s discrete entropy, written for moleculary biologists.

Reader Mike said To the point explanation of the “why” of some of the math. This allows you to look a symbols and understand the _meaning_ not just the math..

ftp://ftp.ncifcrf.gov/pub/delila/primer.ps

IstraSoft appears to make some speech codecs, supplied as Windows DLLs. Plus some discussion on their web page re: English phonetics.

http://www.istrasoft.com/

This site promises to deliver links and copes of every archiver know to man, along with news, polls, and more. The usual disclaimer apologizes for not being quite there due to a recent change in management.

http://archivers.8m.com/

An assortment of links on a wide variety of compression related topics. Includes a rating system indicating the value of the links.

http://www.eee.bham.ac.uk/woolleysi/book_web.htm

MKS makes UNIX utilities available on other platforms. Naturally, this includes pack, unpack, mkszip, and so on.

http://www.datafocus.com/docs/cmd%5Findex.asp

An interactive introduction to Data Compression. Covers lossless methods.

http://www.eee.bham.ac.uk/WoolleySI/All7/body0.htm

A collection of free TIFF software. This may help you decode files in TIFF format. Includes some documentation files.

ftp://ftp.sgi.com/graphics/tiff/

by Bernhard Balkenhol and Yuri M. Shtarkov. Details tests of an improved version of the basic algorithm.

http://www.mathematik.uni-bielefeld.de/sfb343/preprints/pr99133.ps.gz

A page of links on the Lycos portal.

http://dir.lycos.com/Computers/Algorithms/Compression/

Some pseudo-code describing a way to maintain sparce matrices.

http://www.angelfire.com/ri/hirschberg/

The Lycos portal page of links to data compression software. All the usual suspects are here, such as PKWare, along with some others you might have missed.

http://dir.lycos.com/Computers/Software/Data_Compression/

These guys appear to be selling a conventional file compressor that works on quite a few different desktops and mainframes. The product description on the web page manages to obscure the facts with a lot of marketing-ese, so I’m a bit fuzzy on the details.

http://www.iri.com/external/products/xpress/xpress.html