Croquet Project
The Croquet Project asks "What if...we could collaborate with one another in an online dimension to create or simulate anything we wanted to?" Read more about this effort--a combination of open source computer software and network architecture that supports deep collaboration and resource sharing among large numbers of users.
This is in early development version 0.1 The download is 65meg. If you have the inclination, this is a fascinating opportunity. Having downloaded it at midnight I didn't play with it much yet...
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