Wikipedia
Komposé
In computing, Komposé is a free software fullscreen task switcher for the KDE Desktop Environment. As the name suggests, it is inspired by Mac OS X's Exposé.
Komposé provides three different fullscreen modes to view of all your open windows.
- View all your windows in a single virtual desktop.
- View all your windows grouped by virtual desktop.
- View all your windows ungrouped by virtual desktop.
Every window is represented by a scaled screenshot of its own. The user can drag and drop windows from one virtual desktop to another virtual desktop. Also a user can kill a window when it is exposed in fullscreen mode. This program is the basis for Spaces in Mac OS X 10.5 Leopard.
It currently supports the XComposite extension to x.org for faster graphics. It also uses the imlib2 library for fast graphics drawing.