TORCS, The Open Racing Car Simulator, is a highly-portable
multi-platform car racing simulation. It can be used as an ordinary car
racing game, as an AI racing game, and as a research platform.
OpenTTD is a clone of the Microprose game "Transport Tycoon Deluxe", a popular game originally written by Chris Sawyer. It attempts to mimic the original game as closely as possible while extending it with new features.
An interactive Web spreadsheet allowing concurrent table editing.
A program that shows sunrise and sunset times in an attractive chart.