Croquet - open source 2d+3d apps

[mouser]

looks cool..

Croquet is...
...a new open source software platform for creating deeply collaborative multi-user online applications. It features a network architecture that supports communication, collaboration, resource sharing, and synchronous computation among multiple users. Using Croquet, software developers can create powerful and highly collaborative multi-user 2D and 3D applications and simulations.

http://www.opencroquet.org/

from slashdot programmer section

[Gothi[c]]

Have you tried coding in it yet? it's kinda cool
The energiser bunny tutorial/example is very cool