GCollider simulates the interaction of galaxies based on the reduced n-body-calculation.
There are a few similar simulators around but this is the best we have seen. The user has 3D control and can rotate the simulation (half a dozen pre-programmed models are offered, others can be created by inputting the values); a graphic and a table depicting the time/distance/speed ratios are offered.
The results can be saved and the graphics exported has .BMP images of .AVI animated files.
