SimGrav Cosmo Lab A cosmic laboratory for modelling gravitation interactions. Windows binaries free to download, source code on request.
Sodaplay Includes the Soda Constructor, a Java applet that animates two dimensional models made out of masses and springs.
Tacoma Narrows Bridge Simulation A numerical simulation of the collapse of the Tacoma Narrows bridge by Cillian ÓTuama. Download standalone executable for Windows.