Physix is a simulation game that lets you experiment with various things.
You can click and drag shapes around, draw new ones and press keys to make pivots and motors. When you first launch the app, read the instructions or just press some number keys to see the demo scenes. Press ‘h’ to see the help message again.
SkyChart III is a planetarium and telescope control program that shows the sky from any location, past or future, on Earth or beyond.
