7-Zip
7-Zip is a file archiver with the highest compression ratio. The program supports 7z, ZIP, RAR, CAB, ARJ, LZH, CHM, CPIO, RPM, DEB, GZIP, BZIP2, Z and TAR formats. Compression ratio in the new 7z format is 30-50% better than ratio in ZIP format. Also 7-Zip compresses to ZIP 2-10% better than... 7-Zip has additional powerful command line version and FAR Manager support.
http://prdownloads.sourceforge.net/sevenzip/7z432.exe - 821Kb - Download - Screenshot

PowerArc
High efficient Data Compression Library for use with Delphi, C++ or VB. Support Rank, ZIP, BZIP and PPM compression algorithms. Compression ratio more than 1. 5-2 times better than ZIP/RAR archiver. Compression speed up to 8 Mb/sec (on PIII-600).
http://www.softcomplete.com/download/powerarc.zip - 385Kb - Download - Screenshot

MSU Lossless Video Codec
Free high quality lossless video codec. This codec is intended for lossless video compression (used for saving master copies or intermediate rendering results). It has the best compression ration among free lossless video codecs. Supports RGB, YUY2 and YV12. ... Allows to set up loss/compression ratio compromises. ... Allows to set up speed/compression ratio compromise by choosing appropriate motion compensation algorithm. ... Performs accurate denoisng in temporal and spatial domains during lossy compression.
http://www.compression.ru/video/ls-codec/msu-ls-codec.exe - 135Kb - Download - Screenshot

Advanced PDF to JPG converter
Advanced PDF to IMAGE converter converts PDF files to images in JPG, GIF, PNG, BMP, TIFF formats. The PDF to IMAGE converter is a perfect tool for implementing PDF documents data archives. Original document layout is fully preserved. Original PDF formatting and interrelation of text and... PDF to JPG converter: =Can save converted files in various formats - JPG, BMP, GIF, PNG =Accepts user defined compression ratio for images in JPG format: The Compression ratio is customizable when using JPEG. ... A compression ratio of 20:1 results in an image that cannot be distinguished from the original.
http://www.intrapdf.com/download/intrapdf_pdf2jpeg_setup.exe - 3Mb - Download - Screenshot

Easy Compression Library
With Easy Compression Library you can add advanced compression and encryption functionality to your projects as quickly and easily as never before. Based on new original One-Stream technology, this toolkit has everything you need to compress and encrypt files, strings, data packets and even BLOB... Easy Compression Library provides a wide variety of compression algorithms, so you can obtain high speed as well as high compression ratio that make Easy Compression Library your best choice. ... A plenty of advanced compression algorithms ?
http://www.componentace.com/data/distr/ecl.zip - 4Mb - Download - Screenshot

VizUp Standard
VizUp 2 is an ad hoc polygon reduction and optimization system that enables you to reduce the number of polygons in a complex 3D model and optimize its geometry. The end result of such compression is a model with a well-balanced level of details and size, which can be used in virtual reality and... This means you can see the effect of any compression level instantly with a click on the corresponding ratio button. ... Another good thing about VizUp is its unique ability to maintain the visual fidelity of the model even at high compression ratios.
http://www.vizup.com/load/vizup.exe - 927Kb - Download - Screenshot

.netshrink
.netshrink is an executable compressor for managed files. It uses LZMA compression library and can decrease your file size by 50%. It can also protect your files with a password. . netshrink uses LZMA compression library to achieve maximum compression ratios. ... Password protection uses verification based on SHA256 hash function and 256 bit AES / Rijndael encryption.
http://www.pelock.com/download.php?f=netshrink.exe - 305Kb - Download - Screenshot

Advanced JPEG Compressor
Advanced JPEG Compressor for Windows is an invaluable and useful tool for everyone who knows what is a digital image. This is definitely a must-have utility if you own a scanner or a digital camera, use digital images whether at work, or at home. This program allows you to convert images to JPEG... Hold the defined compression ratio is a unique feature for graphic software that allows you to create images whose file size is limited by the defined compression ratio (like the "bit rate" parameter for audio files), and does not depend on their content.
http://www.winsoftmagic.com/download/ajpegcompr.exe - 1Mb - Download - Screenshot

Open Video Converter
Open Video Converter is a powerful video converter for video conversion, splitting and editing. Open Video Converter can convert many video formats such as MPG, MPEG, DAT, ASF, WMV, OGM to AVI file. Open Video Converter can change the frame size, frame rate, video compression codec and audio... Open video converter change video and audio compression codec for avi file. ... Change the frame size, and adjust the video aspect ratio. ... Open compression system for video and audio. ... Open video converter change clip file size with choosing the different encoding bitrate.
http://www.008soft.com/products/OVideoConverter.exe - 540Kb - Download - Screenshot

UnderPressure
UnderPressure is a small tool for optimizing HTML files. It compresses all HTML files in a given folder.
http://www.fantastic-bits.de/download/files/underpressure.zip - 441Kb - Download - Screenshot