ExtractorPC is a free utility for expanding the files in archives created by Compact Pro(tm).

ftp://garbo.uwasa.fi/pc/arcers/ext-pc.zip

PAK is a utility to create and maintain file archives in compressed form. There are several advantages to compressing files. On a hard disk, most files are accessed infrequently. Reducing the size of these files allows more of them to remain on the hard disk, where they are more accessible than on a floppy in a file cabinet, and
frees disk space for other use.

ftp://garbo.uwasa.fi/pc/arcers/pak251.exe

An alternate site for Zip 2.0

ftp://garbo.uwasa.fi/pc/arcers/zcryp20x.zip

This article contains the answers to some Frequently Asked Questions (FAQ) often seen in the USENET newsgroup comp.dcom.fax relating to facsimile standards, software, and hardware. Most importantly, contains an explanation of FAX encoding.

ftp://rtfm.mit.edu:/pub/usenet/news.answers/fax-faq/

The AFsp package contains audio file utility programs and a library of routines for reading and writing audio files. This ftp site contains three different releases of the software. Includes programs to compare, copy, filter, an analyze audio files. Also has resampling, LPC, and noise generation programs. Executables for Windows and Sun, with a wide variety of file formats supported.

ftp://ftp.tsp.ee.mcgill.ca/pub/AFsp/

This FTP site has copies of a wide variety of archiving programs. Includes current programs such as PKZip, ARJ, and RAR, as well as historically relevant programs such as PAK and ARC. Look at 00index.txt for a directory of what’s on hand.

ftp://garbo.uwasa.fi/pc/arcers/

“I do believe that my product is superior to all other compression algorithms to date. It is lossless, works on any file type on any platform, is recursive (ie, the compressed file can be compressed again, and then again, and so on) so that ANY size file can be compressed to 16 bytes or less. I know this sounds like “perpetual motion” but it does work and I can prove it.”

http://groups.google.com/groups?oi=djq&selm=an_424633290

A comparison of JAR, RAR, and PKZIP. Lacks rigor.

http://www.davesite.com/computers/compress5.shtml

This PPM implementation has a complete batch of source code but no external documentation. I believe that all of the code is documented internally in Portugese. Corrections to this theory are welcome.

ftp://ftp.ime.usp.br/pub/mris/ppm.zip

by John C. Kieffer (Information Theory Research Group, Electrical Engineering, University of Minnesota). A survey of techniques for designing codes with minimal redundancy. A Postscript copy of an academic paper.

ftp://oz.ee.umn.edu/users/kieffer/papers/bernoulli.ps

ACIS, the AXAF CCD Imaging Spectrometer, is an instrument being built by a team from the Massachusetts Institute of Technology’s Center for Space Research and the Pennsylvania State University for the Chandra X-ray Observatory (formerly, AXAF), scheduled for launch in 1999.

This is a good paper discussing practical implementation of data compression in a real world project with interesting parameters.

http://acis.mit.edu/huff/

Jerry Gibson, Toby Berger, Tom Lookabaugh, Rich Baker and David Lindberg. Drawing on their experience in industry, research, and academia, this powerful author team combines their expertise to provide an accessible guide to data compression standards and techniques and their applications

Please use
this link to purchase the book through Amazon.com. Your purchase will help support this web site.

http://www.bhusa.com/bookscat/search/details.asp?isbn=1558603697&country=United+States&msc
ssid=PB89QLSG0L4X9HJ22543GFMP6P67BWW7

For those individuals looking for an application that deals with all aspects of JPEG imaging–The JPEG Wizard is it! The JPEG Wizard is based around the premise that altering and processing an image at the algorithmic level instead of the visual level greatly preserves the quality of an image.

http://www.pegasusimaging.com/wizard.html

Download ZLIB for Visual Basic (26kB 24-8-97) ZLIB has been ported to an .OCX by Mark Nelson. If you don’t want the overhead of an .ocx, you can use this zlibvb.bas file (module) to give you access to the basic routines. In order to use it, you’re going to need one of the ZLIB.DLL files from the ZLIB page; I’ve included one of them in the .zip file.
Note: If the link on this page doesn’t work, try
this oneinstead.

http://patb.dhs.org/Programming/ZlibVB.htm

The home page for NRV, the next generation successor to LZO. NRV is a portable lossless data compression library written in C++. It offers pretty fast compression and *very* fast decompression. Decompression requires no memory. NRV is free under the GPL.

DCL reader Luigi T. saidIt would be very useful for my needs, but at the moment the source code seems to not be available.

http://www.oberhumer.com/mfx/nrv/

Charles has a really great collection of software he has written on this page, much of it is indexed here in the appropriate pages. His home page also contains links to some interesting papers and descriptions on various algorithms, as well as some archived posts that explain some compression topics. It’s well worth nosing around this site a bit for more information.

http://www.cbloom.com

By Robert W Buccigrossi and Eero P Simoncelli, GRASP Laboratory Technical Report #414, University of Pennsylvania, May 30, 1997. This page contains the abstract, with links to the full paper, as well as software associated with it.

http://www.cis.upenn.edu/~eero/ABSTRACTS/buccigrossi97-abstract.html

Lecture notes for a course on Information Theory, by John Lafferty, School of Computer Science, Carnegie Mellon University. Includes handouts, problem sets, code, additional lectures, and a page of links.

http://www.cs.cmu.edu/People/lafferty/info-theory.html

By Ross Williams, 1991. A description of a lossless algorithm invented by Ross Williams. The algorithm is based on LZW compression with the addition of a Markov-like prediction engine. Maybe.

http://www.cs.pdx.edu/~idr/unbzip2.cgi?compression/lzrw4.html.bz2

A set of benchmarks for lossless compression of various test sets, including the CCITT B&W images, the Calgary Corpus, and a Gray Scale set. Includes some dates for checking historical progression.

http://www.cs.waikato.ac.nz/~singlis/ratios.html

by Dave Kristula. Has download pages for archivers, plus benchmark results.

http://www.davesite.com/computers/compress.shtml

This page is designed made to teach people about Lossless compression algorithms through the use of text graphics and Java Applets! Dominik Szopa has created pages that demonstrate Huffman, Adaptive Huffman, and LZW compression.

DCL reader SF has this to say: While the site itself is rather quick, it’s disorganized…the Java applets really don’t show what’s going on at all. They show only the external effects…This site has definate potential, and I do recommend people see it. However, it’s also got a ways to go yet. .

http://www.cs.sfu.ca/CC/365/li/squeeze/

http://life.csu.edu.au/complex/

Greenleaf sells ArchiveLib, an archiving library that supports both Zip and a proprietary format

http://www.greenleafsoftware.com

Chris Hillman’s page of links to Information Theory pages, papers, etc.

http://www.informatik.uni-trier.de/~damm/Lehre/InfoCode/entropy.html

Leonid A. Broukhis puts his money where his mouth is by offering a cash prize for good, reproducible compression. He has paid out at least one modest prize.

http://www.mailcom.com/challenge

http://life.csu.edu.au/complex/faq.html

By David G. Green, Environmental and Information Sciences, Charles Sturt University. A short tutorial that provides an introduction to just what fractals are all about.

http://life.csu.edu.au/complex/tutorials/tutorial3.html

Search for things here

http://life.csu.edu.au/vl_complex/

The home page for the shareware ACE archiver, including download links. Both self extracting and Zipped versions of the file are available from this page. This page also includes free source code for UNACE, and variants on ACE and UNACE. Reader comment Excellent user interface, better compression than Zip.

http://members.aol.com/mlemke6413