OpenSimulator

= the open source implementation of Second Life Metaverse

URL = http://opensimulator.org/wiki/Main_Page

Description

"OpenSim is the open source implementation of Second Life (but using .NET, alas); its existence is what makes the new Open Grid possible. Without the open source behind it, this would simply be a closed approach similar to old-style online services such as AOL or CompuServe. Linden Lab's decision to open up its protocols means that there is a chance to create a virtual world equivalent of the Internet, which anyone can use, and where anyone can contribute." (http://www.computerworlduk.com/toolbox/open-source/blogs/index.cfm?entryid=1095&blogid=14)