Rodrigo Castro has an interesting project going at the University of Sao Paulo in Brasil. Rodrigo is integrating compression with the virtual memory system of Linux. By storing compressed pages in RAM, he hopes to improve overall system performance. The goal is to read and write fewer pages to disk. See the full details on
his project page
at SourceForge.

http://linuxcompressed.sourceforge.net/

Aladdin Systems, makers of the popular Stuffit program, have a free program called Expander that can be used to extract files from many popular archive formats, including Zip, Sit, and more.

http://www.stuffit.com/expander/index.html

The home page for the society. Links to newsletters, conferences, tutorials, abstracts, and other miscellaneous fun things.

http://www.itsoc.org/

Mikael Lundqvist has adapted Dmitry Subbotin’s C++ rangecoder to C. Michael says it is simple and fast.
One DataCompression.info commented that some more documentation would be helpful.

http://w1.515.telia.com/~u51507446/range.tgz

shnutils is a collection of 3 Perl scripts developed to assist in the process of using shorten to trade digital music. These scripts, which run on both Linux and Windows, facilitate compressing WAV files using shorten, and also in creating and verifying MD5 hashes.

http://freshmeat.net/projects/shnutils/

This archiving package works with zip files, creates encrypted archives, wipes files, etc.

http://www.secureaction.com/encryption/

Daniel Ricardo has a new algorithm for generation of Huffman codes. He claims superior performance and small memory footprint. Algorithm description here, but no code.

http://www.rootshell.be/~dan/hrc.html

Tom St Denis posted an article on comp.compression announcing free source code for streaming to and from files using the LZO engine. This link takes you to stream.c, modify it slightly to get stream.h, the corresponding header file.

http://tom.iahu.ca:8080/src/stream.c.html

Pandora is a web-oriented application of JPEG 2000. It uses web pages as a novel example of XML metadata. A multi-image, multi-page website can be stored within a single JPEG 2000 file, and viewed using an ordinary web-browser.

http://www.migrator2000.org/pandora

In this comp.compression posting, Ben Rudia-Gould opens up the compression format used by the PKWare Data Compression Library. This is the only place I have ever seen this information disclosed; PKWare has certainly not done so.

http://groups.google.com/groups?q=author:Ben+author:Rudiak-Gould&hl=en&rnum=1&selm=34259d5
2.0108131038.21dd88f9%40posting.google.com

EE Times reports that both TI and SMT are making chips that support the new MP3Pro format, clearing the way for its inclusion in portable audio devices.

http://www.eet.com/story/OEG20010921S0021

Glicbawls is a lossless and/or near-lossless image compression algorithm that apparently does really well on gray-scale images but perhaps not as well on color. This link points to an archived page, as the original has disappeared from the net. As a result, links on the page may or may not work propery

http://web.archive.org/web/20020604145417/http://byron.csse.monash.edu.au/glicbawls/index.
html

A technical note from Mike Burrows regarding a variation on block sorting.

http://citeseer.nj.nec.com/432943.html

Apple has published a tech note describing the differences between these two file formats, which on the face of it ought to be identical.

http://developer.apple.com/technotes/tn/tn1081.html

These folks are hard at work on an open source video codec. VP4 appears to be a commercial effort, VP3 seems to be free.

One DataCompression.info user had this to say: Impressive effort by both ON2 and Xiph. Something has to replace MPEG with its rapidly deteriorating technnology and efficiency. This one has the potential but now needs the acceptance.

http://www.vp3.com

From the site: The libcomprex library transparently handles automatic compression and decompression of files. The API is similar to C’s built-in file access functions, which provides a smooth transition to libcomprex. libcomprex can also open uncompressed files, making it a good replacement for the native file access functions.

http://www.gnupdate.org/components/libcomprex/index.xml

This web page explains a proposed categorizaton of various data compression methods.

http://geocities.com/eri32/summary.html

This article describes a variant on BWT that doesn’t use the cyclical rotations of strings used for BWT, but a different scheme. DCL reader points to a Burrows paper showing that this scheme is suboptimal.

http://geocities.com/eri32/slrm.htm

ArjFolder is a utility that makes it easy to read or write ARJ and ZIP files, and to read a slew of other file types. Sit can be viewed in French or English.

http://www.iceows.com/

This is the PicTools JPEG2000 SDK, which lets you drop JPEG2000 compression and decompression into your C/C++ programs. Pegasus Imaging makes quite a few compression library products. In this particular case, it appears they enlisted the help of

Algo Vision plc to develop this product.

http://jpeg2000.jpg.com/

An open source lossless audio file compressor.

http://sourceforge.net/projects/kexis/

From the site: Pngcrush is an optimizer for PNG (Portable Network Graphics) files. It can be run from a commandline in an MSDOS window, or from a UNIX or LINUX commandline. .

http://pmt.sourceforge.net/pngcrush/

Mpegplus is an open source lossy encoder that the author apparently has created in response to dissatisfaction with existing MP3 encoders. MP+ has plugins for WinAmp and other players.

http://www.personal.uni-jena.de/~pfk/mpp/audiocoder_english.html

The author of this page clearly has a bone to pick with some of the MP3 decoders out there. From the site: This site contains test results on a number of mp3 decoders. Such a test wouldn’t be necessary if all decoders worked properly, but unfortunately they don’t. In fact the outputs of many popular decoders were found to be incorrect. .

http://web.archive.org/web/20020124200304/http://privatewww.essex.ac.uk/~djmrob/mp3decoder
s/intro.html

The folks at Qdesign have a new audio encoding format they’d like you to use.

http://www.qdesign.com/

A set of subjective tests of various encoders.

http://fastforward.iwarp.com/1400.html

Real takes a whack at their chief competitor, Microsoft. Looks like they put some time and effort into this.

http://www.real.com/msaudio/

A giant bibliography with pointer to on-line papers, as well as some basic information on the state of the art. Not for the timid or the beginner.

ftp://axes.informatik.uni-leipzig.de/pub/Fractal/index.html

From the site: daxaif is a no-loss audio compression program which performs live capture or converts audio files, movie sound tracks, or audio CD tracks into a compressed “.dax” file format. This format allows fast locating and selection of audio passages through the use of a clickable compression-factor map. The selections can be played or saved in uncompressed AIFF or further compressed to AIFC format using any QuickTime-supported compresser. .

http://www.dakx.com/daxaif/

This example from Sun shows how to create a file using the library components in java.util.zip.

http://developer.java.sun.com/developer/codesamples/examplets/java.util.zip/169.html