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ZLIBC
Zlibc allows applications to transparently access compressed files. As soon as the application attempts to open a compressed file, zlibc uncompresses the data on the fly. No kernel patch, no recompilation of the executables nor the libraries is needed.
zlibc.linux.lu/

GZIPSite Website Compression
Tool that can help you make static HTML websites run 50% faster and save 50-80% of the bandwidth.
www.applet.dk/

Markus F.X.J. Oberhumer: lzop file compressor
lzop real-time file compressor
www.oberhumer.com/

devCompress.Net
A Zip compression library for .NET developers.
www.devbiz.com/

Chilkat ZIP.NET
Implements standard Zip compression tasks. Zip and UnZip files and directories, or directly from application memory.
www.chilkatsoft.com/

InOz FileCrypto
A .Net component that allows applications to encrypt and decrypt files using Microsofts's .Net Cryptography encryption algorithms.
www.filecrypto.com/

PowerTCP Zip Compression Tool
Add powerful file compression and AES encryption to any Windows or ASP application.
www.dart.com/

Xceed Zip Compression Library
A software component that provides functions for compressing and uncompressing files and data. Its most popular functionality is the ability to create, read and write Zip files.
www.xceedsoft.com/

Lossless Image Compression with Switched Linear Prediction
By Shinji Wakasugi. A simple method for lossless image compression using switched linear prediction. Report in PDF with code in C.
www3.tokai.or.jp/

Compression via Arithmetic Coding in Java
Unrestricted open-source Java implementation of the PPM (prediction by partial matching) algorithm for text and data compression by Bob Carpenter. Builds with ant.
www.colloquial.com/