The theme of the website which you can enter below is actually the computer simulation of quantum mechanics, but you can also find a modest relativistic flight simulator. There are a couple of other programs on special relativity.
This relativistic flight simulator is available in two versions. There is a QBasic version to run in interpreted source code mode. Better than that is a PKZIPped compiled object code version with instructions on how to run it in unzip-and-go mode.
You will also find hotlinks to other people's work from this site, and the author has produced a separate page of links to relativistic flight simulators.
