KSnapshot is a simple applet for taking
screenshots. It is capable of capturing images of
either the whole desktop, or just a single window.
The images can then be saved, or passed to
another application using drag and drop.
amiwm is an X window manager that tries to make your display look and feel like an Amiga® Workbench® screen. It is fully functional and can do all the usual window manager stuff, like moving and resizing windows.