Super simple compositing window manager for X11 written in C with Xlib and OpenGL (through GLX). Initially this was for prototyping the aquabsd.alps.wm device for aquaBSD to, well, manage windows. The point was for it to be a minimal viable example of a compositing window manager.

I got to visit the DLR in Braunschweig who based a WM on this one to project onto a large spherical screen for use in a helicopter simulator on this code. On the right is a photo of my friend Aditya attempting to fly it.

Braunschweig and Hanover, which we also stayed at, are both very nice cities. I recommend visiting them if you're in the area.