As I told earlier I had a little side project the other day, and wrote a demo called Frequency/Bush in D/OpenGL/SDL/gstreamerD/Linux.
Now you can watch it as a video in here.
It finished 7th in the Alternative Party 2007. Results. Get binary and the code (which is impossible to compile at the moment but is now final and closer to what was actually shown in the party). The binary is for Ubuntu Feisty (But should work with later Ubuntus and possibly other linuxes as well. Just install gstreamer-0.10-plugins-bad and other more obvious stuff). It’s not a good demo, but it’s my first, and made with D.