StepMania is a free dance and rhythm game for Windows, Mac, and Linux. It features 3D graphics, keyboard and "dance pad" support, and an editor for creating your own steps. Its based on the popular dance-step games available in arcade halls. StepMania allows users to create their own custom dance patterns.
SkyChart III is a planetarium and telescope control program that shows the sky from any location, past or future, on Earth or beyond.
