Barbarella is a user-configurable buttonbar intended to provide single-click access to applications and commands for simple Linux GUIs such as fluxbox. The content of each bar (icons, tooltips, and programs to be launched) is entirely determined by a configuration file with a simple syntax. Each line in the file defines one button. The default configuration file is $HOME/.barbarella.conf, but other files can be used, allowing users to have different buttonbars for different purposes.
PylotLight is a cross-platform, themeable, plugin-supporting system for general computing tasks. It is comparable to QuickSilver, which you may recognize if you use a Mac. Current plugins exist for Web searches, Firefox bookmark launching, filesystem browsing and managing, subversion control, terminal control, and more.
bgs allows you to tailor the appearance of the background ("root") window on a workstation display running X. It uses imlib2 for image rendering and rotates the images automatically. It is designed for dynamic Xinerama/Xrandr setups such as those used with notebooks, but it works well in any setup.
qtrayvolman handles hot-pluggable devices and removable media that are added to or removed from the system. It displays a nice icon in the system tray for each volume. It uses D-BUS and HAL to listen for new devices. It provides functionality for mounting and unmounting and runs pcmanfm for a given volume.