Conky is a system monitor that can display just about anything, either on your root desktop or in its own window. Conky has many built-in objects, as well as the ability to execute external programs or scripts (either external or through built-in Lua support).

Ukopp is used to copy or back-up disk files to a disk or disk-like device, such as a USB stick. It copies only new or modified files since the last backup, and is therefore quite fast. A GUI is used to navigate the file system to include or exclude files or directories at any level. These choices can be saved in a job file for repeated use. New files appearing within the included directories are handled automatically. Optionally, previous versions of the backup files can be retained instead of being overwritten. Files can be selectively restored using a GUI. Ownership and permissions are also restored, even if the target device uses a Microsoft file system.

Cairo-dock has a family-likeness with OS X dock, but with more options. It uses cairo to render nice graphics, and Glitz to use hardware acceleration. It's fully configurable and can be a taskbar too. You can easily plug applets into it.

PulseAudio, previously known as Polypaudio, is a sound server for POSIX and WIN32 systems. It is a drop in replacement for the ESD sound server with much better latency, mixing/re-sampling quality and overall architecture.

DConf is a low-level key/value database designed for storing desktop environment settings.

RawTherapee is an advanced program for developing raw photos and for processing non-raw photos. It is non-destructive, makes use of OpenMP, supports all the cameras supported by dcraw and carries out its calculations in a high precision 32bit floating point engine. RawTherapee supports JPEG, PNG, and TIFF as output format for processed photos.