The Optics Project on the Web (WebTOP) is a 3D, interactive computer graphics system that visualizes optical phenomena. Its purpose is to help instructors teach and students learn about optics. It is a platform independent Java application that uses X3D.
gSky Digest is a system tray desktop application that presents astronomy events calculated for your home location. Currently it comes with detailed information about the Sun, the Moon and 7 planets. See Project Web Site for more details.
The program system JCASim is a general-purpose system for simulating cellular automata in Java. It includes a stand-alone application and an applet for web presentations.