7-Zip
7-Zip is a file archiver with high compression ratio. Distributed under GNU LGPL, it supports many different compression formats. http://www.7-zip.org
bzip2
bzip2 is a freely available, patent free, high-quality data compressor. It typically compresses files to within 10% to 15% of the best available techniques (the PPM family of statistical compressors), whilst being around twice as fast at compression and six times faster at decompression http://www.bzip.org
FilZip
Another full-featured compression utility. Supports: ZIP, BH, CAB, JAR, LHA, LZH, TAR, and GZIP http://www.filzip.com/
IZArc
IZArc is the ultimate archive utility that suports many archive formats like: 7-ZIP, A, ACE, ARC, ARJ, B64, BH, BZ2, BZA, CAB, CPIO, DEB, ENC, GCA, GZ, GZA, HA, JAR, LHA, LIB, LZH, MBF, MIM, PAK, PK3, RAR, RPM, TAR, TAZ, TBZ, TGZ, TZ, UUE, WAR, XXE, YZ1, Z, ZIP, ZOO http://www.florida.plus.com/izarc
QuickZip
Great comparer to WinZip, it also supports windows shell integration. http://www.quickzip.org
TUGZip
TUGZip is a powerful award-winning freeware archiving utility for Windows® that provides support for a wide range of compressed, encoded and disc-image files, as well as very powerful features; all through an easy to use application interface and Windows Explorer integration. http://www.tugzip.com/
UltimateZIP
UltimateZip is an easy to use archive utilty. With it's flexible user interface, UltimateZip is easy to use for first-time users and offers many features for power users. http://www.ultimatezip.com
UPX
The Ultimate Patcher for Executables. Check Out http://upx.sourceforge.net
Zip&Go
Try this state-of-the-art compression utility. This is the easiest and most effective way to work with ZIP files both for experts and amateurs. http://www.handybits.com/zipngo.htm
Zipgenius
ZipGenius is the absolutely free software for Windows® that lets you compress files to almost any kind of archive. ZipGenius supports more than 20 compressed archive formats, including CD/DVD-ROM image files in ISO9660 standard. This is the file compression suite you were searching for: it is free and easy to use, plus it supports more than 20 formats of compressed archives, including RAR, ARJ, ACE, CAB, SQX, OpenOffice.org documents and the excellent 7-zip http://www.zipgenious.it