Xplanets is a simulator that shows a spaceship moving through the solar system. The spaceship's movements are influenced by gravity from the sun and the planets according to Newton's laws, and by the acceleration that the engines provide. The planets move around is (simplified) round orbits.
The Robot Auto Racing Simulator (RARS) consists of a simulation of the physics of cars racing on a track, a graphic display of the race, and a separate control program (robot "driver") for each car. The goal of the game is to implement such a control program in order to compete against other programmers. An official formula one season is held every year.
Tow Bowl Tactics is a game based on Games Workshop's Blood Bowl. It is an epic conflict between two teams of heavily-armed and quite insane warriors. Players pass, throw, or run with the ball, attempting to get it to the End Zone at the end of the field to score a touchdown. Games are full of violence and carnage and could be compared to a combination of Warhammer, American football, and rugby.