System utilities
7-Zip
7-Zip is a file archiver with a high compression ratio.
Website: http://www.7-zip.org/
Amanda -
AMANDA, the Advanced Maryland Automatic Network Disk Archiver, is a backup system that allows the administrator to set up a single master backup server to back up multiple hosts over network to tape drives/changers or disks or optical media. Amanda uses native dump and/or GNU tar facilities and can back up a large number of workstations running multiple versions of Unix. Amanda uses Samba, Cygwin or a native Windows client to back up Microsoft Windows desktops and servers.
Website: http://www.amanda.org/
GParted
GParted is an industrial-strength package for creating, destroying, resizing, moving, checking and copying partitions, and the file systems on them. This is useful for creating space for new operating systems, reorganizing disk usage, copying data residing on hard disks and mirroring one partition with another (disk imaging).
http://gparted.sourceforge.net/
InstallJammer
InstallJammer is a multiplatform GUI installer designed to be completely cross-platform and function on Windows and most all versions of UNIX with support for MacOS X coming soon.
http://www.installjammer.com/
K3b
K3b was created to be a feature-rich and easy to handle CD burning application.
Website: http://k3b.plainblack.com/
Open-source ARJ
open-source implementation of the world-famous ARJ archiver. This version has been created with an intent to preserve maximum compatibility and retain the feature set of the original ARJ archiver as provided by ARJ Software, Inc.
Website: http://arj.sourceforge.net/
VirtualBox
VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.
Website: http://www.virtualbox.org/
NSIS
NSIS (Nullsoft Scriptable Install System) is a professional open source system to create Windows installers. It is designed to be as small and flexible as possible and is therefore very suitable for internet distribution.
Website: http://nsis.sourceforge.net/
UPX
UPX is a free, 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 for most of the formats supported, because of in-place decompression.
http://upx.sourceforge.net/