Screen shot 1
Screen shot 2
Taken from Skippy's official website:
Skippy depends on:
* An X11R6 server
* Xft - the X Font library
* Imlib2 (only for 'regular' Skippy, not skippy-XD)
* XRender, XComposite, XDamage and XFixes extensions (only for Skippy-XD)
* A NETWM or GNOME WM Specs compliant window-manager.
So far, it's been sucessfully tested using OpenBox-3.2, Fluxbox-0.9.9 (thanks daelstorm!), XFWM4 (thanks SeeSchloss!), Metacity (thanks SmackleFunky!), WindowMaker (thanks SuperBFG7), IceWM (thanks Tomasz Torcz), PekWM (thanks Josh Chaney), Waimea (thanks Gad 'make-up-your-mind' Kadosh) and KWin (no, BlackBox and ion aren't supported).
Note: if you want to use skippy with WindowMaker, make sure WindowMaker is compiled with gnome support.
Another note: If you use KDE, Skippy might have trouble grabbing the F11 key. You can make it bind to a different key in the config file (see the skippyrc-default file that's in the tarball). Scroll_Lock is reported to work (thanks Dmitriy!).
Because of the way standard X11 works, Skippy has to raise all windows before it can take a snapshot. If there's something that obscures the window (like a window in a layer above it), Skippy won't be able to make a snapshot correctly.
Skippy-XD is a version of Skippy that uses the new XDamage, XComposite and XFixes extensions (found in FreeDesktop.org's Xserver project) to provide you with 'live' versions of the windows. Exciting, isn't it?