CitizenEarth^® will shortly (Q3 2010) launch a new product, the Kerlin™ framework for developing and deploying Rich Internet Applications.

In the meantime, if you have the Tcl/Tk Browser Plugin, you may enjoy the following Applets:

Games

Tetris (click the link to run the Applet)

Solitaire (click the link to run the Applet)

Mathematics

Langton's Ant (click the link to run the Applet)

The Ulam Spiral (click the link to run the Applet)