JoyWM (formerly known as Linux Multimedia System or LMMS) is a multimedia GUI written in Python/Pygame. It provides an easy-to-use GUI for tasks such as listening to music, watching movies, viewing pictures, and playing some games. It is appropriate for use on a TV and can be controlled with a joystick (or a keyboard if no joystick is present).
transset-df is a heavily patched version of xorg's transset. It is used to set the transparency of windows in X with the xcomposite extension. It adds several command line options to make it easier to use directly, bound to hot keys in your window manager, or through scripts. These include the ability to select a window by window ID.
WnDO (formerly Fbdo) is a small suite of complementary tools for adding behavioral extensions to Gnome, Xfce, Fluxbox, and other window managers. WnDO offers a plugin platform for tweaking the desktop environment. It focuses on modifying behavior, rather than adding desktop widgets. It has minimal dependencies, other than Python. Included modules handle window alignment, simple window tiling, process management, wallpaper management, and custom keyboard shortcuts. Wallpaper management capabilities include per-workspace and randomly-selected wallpaper. It performs its own key grabbing in order to avoid interaction and conflict with the equivalent window manager facility. It requires CmDO.
Perl OS is a program that provides an easy interface to run Perl/Tk programs. It was also created to be an easy working environment, complete with a text editor, paint program, and more. It comes with several programs, along with a utility to add many more which can be found on the Internet. From the outside, Perl OS looks like a simple operating system. But inside, it is a powerful system for working with Perl and Tk.
Fitz is a window decoration for KDE that allows you to work (or play) faster. Unlike other decorations, it does not have a title bar above the window. Instead, it puts the buttons in the menu bar. As a result, it lets you get to a menu item by ramming your mouse into the top of the screen. If you click on the window frame, the mouse will jump down into the middle of the menu bar and Fitz will generate a click. This effectively puts the menu bar at the top of the screen like Mac OS does.