Freeware/File Compression

Name	Description
7-Zip	recommended - 7z is a compressed archive file format that supports several different data compression, encryption and pre-processing filters. The 7z format initially appeared as implemented by the 7-Zip archiver. Both the 7-Zip program and a library to read the 7z file format are publicly available under the terms of the GNU Lesser General Public License.
IZArc	IZArc is the ultimate freeware archive utility supporting many archive formats like: 7-ZIP, A, ACE, ARC, ARJ, B64, BH, BIN, BZ2, BZA, C2D, CAB, CDI, CPIO, DEB, ENC, GCA, GZ, GZA, HA, IMG, ISO, JAR, LHA, LIB, LZH, MDF, MBF, MIM, NRG, PAK, PDI, PK3, RAR, RPM, TAR, TAZ, TBZ, TGZ, TZ, UUE, WAR, XXE, YZ1, Z, ZIP, ZOO. With a modern easy-to-use interface, IZArc provides support for most compressed and encoded files, as well as access to many powerful features and tools. It allows you to drag and drop files from and to Windows Explorer, create and extract archives directly in Windows Explorer, create multiple archives spanning disks, creating self-extracting archives, repair damaged zip archives, converting from one archive type to another, view and write comments and many more. IZArc has also build-in multilanguage support.
CabPack	A compression program with which you can create cabinet (.CAB) files. With just a few mouse clicks you specify which files to compress, which compression method to use, where the output files should go and whether or not the cabinet files should span multiple disks. CabPack is able to store subdirectories, and depending on the platform you wish to extract the cabinets on, it can create .CAB files that contain long filenames or store these long filenames in the 8.3 format.
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.
Ultimate Packer for eXecutables ("UPX")	UPX is a versatile executable packer
WinUHA	WinUHA is a powerful GUI (Graphical User Interface) for UHARC, UHARC is a high compression multimedia archiver. It has a better compression ratio than ZIP, RAR, ACE, etc...
ZipGenius	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. ZipGenius now can precompress executable files going to be added to a ZIP archive through the UPX compressor.