This must be the craziest thing I've seen in a long time.
wmQuake allows you to play Quake in a WindowMaker dockapp!
It doesn't compile anymore on modern systems, but I've taken it upon to
fix its Makefile so you can use it again.

It looks something like this:



I personally use this to run all sorts of fun demos in the background for no reason whatsoever. It's a fun gimmick.

Grab it and the source-code to it here: (someone else is maintaining it now)
-- Marco