NxServLiv allow compressed remote X sessions using NoMachine’s NX oss libraries. Like ssh terminal but graphical. Work from Modem to Lan with different compression ratios

http://sourceforge.net/projects/nxservliv/

Another difference engine in C#.

http://codeproject.com/csharp/DiffEngine.asp

PDF documents are commonly used and their content is usually compressed. This article shows a simple C code that can be used to extract plain text from the PDF file.

http://www.codeproject.com/cpp/ExtractPDFText.asp

Java & MPEG-7 based tools for semantic annotation and retrieval of digital photos and images supporting graph like annotation and content based image retrieval.

http://sourceforge.net/projects/caliph-emir/

C# implementation of adaptive Huffman coding. Implements both the FGK and Vitter algorithm variations. Compression provided through two public classes, AdaptiveHuffmanProvider and AdaptiveHuffmanStream. Good compression ratios for text-based data

http://www.gotdotnet.com/Community/UserSamples/Details.aspx?SampleGuid=c8bc181b-5ddf-4969-
aeca-a508374f1282

From Microsoft: This document describes Binary Delta Compression (BDC) technology and its use in software update deployment. This implementation of BDC technology developed by Microsoft reduces the download size of software update packages by downloading only the differences between old files and new files.

http://www.microsoft.com/downloads/details.aspx?FamilyID=4789196c-d60a-497c-ae89-101a3754b
ad6&DisplayLang=en

DACT is a brute force compressor written by Roy Keene that tries out a whole library of compression routines on a given file, and then simply picks the best performer.

Release 0.8.36 was shipping in early March, 2004.

http://www.rkeene.org/oss/dact/

A pre-compression transform by Przemyslaw Skibinski, somewhat along the lines of Star Encoding.

Version 3.0 of this program is shipping as of February, 2004.

http://www.ii.uni.wroc.pl/~inikep/research/WRT30.zip

Compression is concerned with detecting patterns in order to reduce redundancy. Complearn is an attempt to take that pattern-recognition ability and use it for different ends.

http://complearn.sourceforge.net/

GAO Research sells modem software for quite a few different platforms, including a big batch of DSP parts. Naturally, this includes modules to perform both V.42bis and V.44 data compression.

http://www.gaoresearch.com/products/modemsoftware/modemsoftware.php

The LuraDocument.jpm PdfCompressor is a Windows application that can be used to automatically (Server version) or manually convert scanned documents to higly compressed PDF files. The supported input formats are TIFF, JPEG, BMP and PNM.

http://www.algovision-luratech.com/products/luradocument_jpm/pdf/

Marcel de Wijs has written an article on creating CRC codes in C#.

http://www.codeproject.com/csharp/marcelcrcencoding.asp

A C++ hierarchy that is designed to efficiently read and write bit streams. Needless to say, this is quite useful for compression programs.

Version 1.0 shipped in December, 2003.

http://sourceforge.net/projects/mffmbitstream/

Star Encoding performs some preprocessing on text files, enabling standard compressors to do somewhat better on the files. This article explains the transform and provides some sample code.

http://marknelson.us/articles/Star/

This product advertises itself as a simple S3TC texture compression
tool. The description says that it loads an image file into your video card’s RAM, then instructs the video card to compress it.

http://www.hut.fi/~vhelin/boxen.html

A Mac OS X utility to shrink the huge PDF files created by the Mac Quartz rendering engine.

http://www.metaobject.com/Products.html#PdfCompress

This site appears to the home page for a project dedicated to developing an Open Source X Windows compression library.

http://www.nomachine.com/developers.php

by Marc van Kreveld. This paper looks at a method for compressing geographical elevation data.

http://archive.cs.uu.nl/pub/RUU/CS/techreps/CS-1997/1997-32.pdf

Free PDF Compressor that removes duplicate PDF objects, optionally takes advantage of new compression features of latest PDF specification (1.5), and optionally takes advantage of a new proposed format called “Compact PDF” that for many classes of documents compresses 30 - 60% better than what is possible in PDF 1.5.

Note: Navigate up two levels to get to Tom’s download page.

Version 2.2 is shipping as of February, 2004.

http://http.cs.berkeley.edu/~phelps/Multivalent/Tools/pdf/Compress.html

The Open Compression Toolkit is a set of modular C++ classes and utilities for implementing and testing compression algorithms.

• Simple interface and skeleton code for creating new compression algorithms.
• Complete testing framework for validating and comparing new algorithms.
• Support for algorithms that use external dictionaries/headers.
• Utility classes and sample code for bitio, frequency counting, etc.

http://octane.sourceforge.net/

This cool program uses either Zip file or JPEG file to encrypt some of your data. I think it’s free, email me if I’m wrong.

http://www.sfu.ca/~vwchu/zjmask.html

This program is designed to accurately create a difference file between two packages, allowing for an update with a minimal source file.

http://deltup.sourceforge.net/

Soft Defender is a good exe file compressor, which can reduce the file size of 32-bit Windows programs by as much as 50%.In addition, Soft Defender is a perfect product of software protection of applications.With Soft Defender, your application can have anti-debugging, anti-tracer, anti-disassemble, anti-dumping, anti-apihook, file integrity checking functions in seconds. It requires no source code editing or your registration algorithm changing.

http://www.softdefender.com/

This article on The Code Project web site shows you how to calculate a CRC, but even better it shows you how to create a file that will have a given CRC value.

http://codeproject.com/useritems/crcspoof.asp

Convert your CHM help files from Microsoft to Adobe’s PDF format. This is shareware that runs on Win32 platforms.

http://www.colorpilot.com/chm2pdf.html

This CodeProject article describes the development of a PATRICIA trie in the .NET framework. The actual code is written in C#, but naturally, it can be used with any of the .NET languages.

http://codeproject.com/useritems/PatriciaTrie.asp

This is a somewhat unique utility that will only be useful to those of you working on Visual Studio programming projects. Running it erases all your temporary project files, then zips up all the leftovers so you can backup your work.

http://codeproject.com/file/CleanZipAndGo.asp

Links to code and tools to create random numbers. Quite useful, and includes some intriguing use of sound cards to provide true (instead of psuedo-random) numbers. Registration required.

http://www.mathtools.net/C++/Random_numbers/index.html