SoundStepper is a "100% software" telescope controller, for Windows, using audio hardware to control step motors at real time. All it requires to operate are external step motor drives, which can be a commercial "pulse/direction" drive or analog current amplifiers.
Documentation: http://soundstepper.sourceforge.net/
A robotic DIY styrofoam cutter consisting of one rotational and two translational axes. It cuts a variety of shapes out of styrofoam-like materials using a hot wire. This project documents the necessary hardware and software parts.
Don't miss the follow-up project at http://raumschaum.org
Its goal is to further develop hardware and software into an user friendly application.