Download HjSplit for free, this free program will help  you  split any file you like into parts of a predefined size, so that sharing them or storing them is made easier. It can also join split files back together and compare parts to see if they’re the same.

A small but very effective little utility which will split and rejoin any file you like.
Languages:

English
Minimum requirements for HJSplit:

* OS: Win95/98/98SE/Me/2000/NT/XP/2003/Vista

With AutoUnpack you can automatically download, repair (PAR), and unpack all RAR, 7z, zip, TS - archives, or splitted files (*.001), this tool very useful !

What’s New in version 4.5.2:

New Features:

* Reprocessing time greatly reduced
* Real-time archive status updates
* Skip archives that are probably still in download. (Setting added: “Suggest that an archive is completely downloaded after being idle for X minutes”)
* Show free disk space of source-, and destination drive (real-time)
* Beta version support
* Auto Upgrade check can be disabled
* One can only run one instance of AutoUnpack now

Download UPX now, this is  portable, extendable, high-performance executable packer for several different executable formats. It achieves an excellent compression ratio and offers very fast decompression. Your executables suffer no memory overhead or other drawbacks because of in-place decompression.

What’s New in version 3.03:

* implement cache flushing for PowerPC (esp. model 440)
* fix cache flushing on MIPS (>3 MiB compressed, or with holes)
* fix MIPS big-endian
* bug fixes

Download 7-Zip now, this is a file archiver with a high compression ratio.

The main features of 7-Zip:

* Highest compression ratio in new 7z format with LZMA compression
* 7-Zip is free software distributed under the GNU LGPL
* Supported formats: 7z, ZIP, CAB, RAR, ARJ, GZIP, BZIP2, TAR, CPIO, RPM and DEB
* For ZIP and GZIP formats 7-Zip provides compression ratio that is 2-10 % better than ratio provided by PKZip and WinZip
* Self-extracting capability for 7z format
* Integration with Windows Shell
* Powerful File Manager
* Powerful command line version
* Plugin for FAR Manager
* Localizations for 47 languages
* works in DOS using HX Extender
* There is port of command line version for DOS, Linux/Unix.

Free Compression tool, 7-Zip is a file archiver with a high compression ratio.

The main features of 7-Zip:

* Highest compression ratio in new 7z format with LZMA compression
* 7-Zip is free software distributed under the GNU LGPL
* Supported formats: 7z, ZIP, CAB, RAR, ARJ, GZIP, BZIP2, TAR, CPIO, RPM and DEB
* For ZIP and GZIP formats 7-Zip provides compression ratio that is 2-10 % better than ratio provided by PKZip and WinZip
* Self-extracting capability for 7z format
* Integration with Windows Shell
* Powerful File Manager
* Powerful command line version
* Plugin for FAR Manager
* Localizations for 47 languages
* works in DOS using HX Extender
* There is port of command line version for DOS, Linux/Unix.