http://upx.sourceforge.net/
the Ultimate Packer for eXecutables
Version 2.00
27 Apr 2006
Very simple to pack the exe file with it.Just like:
upx filename.exe
Upack is easy too...
upx -d filename.exe
ThanXs for GaLwaY2000's introducing...
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News
UPX 2.00 has been released. Please report all problems and bugs in our bug tracker.
The main news in version 2 are:
new format: added support for arm/pe (ARM executables running on WinCE)
new format: added support for linux elf/amd64
new format: added support for linux elf/ppc32
new format: added support for mach/ppc32 (Apple Mac OS X)
new format: added support for bootable Linux kernels ("vmlinuz/386")
new format: added support for Playstation exes ("ps1/exe")
slightly better compression using the new NRV2E algorithm
new options for compression tuning (e.g. '--brute')
improved win32/pe compatibility
direct ELF-to-memory decompression
various bug fixes
Also have a look at the more detailed ChangeLog.
UCL 1.03 has been released.
UPX is rated number one in the well-known Archive Comparison Test .