OpenSimulator is a 3D Application Server. It can be used to create a 3D Virtual World (ala Second Life(tm)), and includes facilities for creating custom avatars, chatting with others in the environment, building 3D content in world, and creating complex 3D applications in world. OpenSimulator can also be extended via loadable modules or web service interfaces to build more custom 3D Applications. OpenSimulator is released under a BSD License, making it both open source, and commercially friendly to embed in products.
Search Grid_List or lets have a look at http://openlifegrid.com/ as an example 😉 or http://www.osgrid.org/ and others Avalon (didnt check that yet)
The Diva Opensim
Easy opensim installation and the Download link and the installation.
Wifi – A Simple Account Management Front-end
Download Assets and SIMs and Stuff https://myopensim.com/ or OpensimWorlds
The hypergrid is an extension to opensim that allows you to link your opensim to other opensims on the internet, and that supports seamless agent transfers among those opensims. It can be used both in standalone mode and in grid mode. The hypergrid is effectively supporting the emergence of a Web of virtual worlds.
(old news October 2008)
PFFFFFFF! Have no time for this play. The windo$ client gives a Microschrot error and on Mac also no phun ;(
July 2010 Opensimulator works perfect, I LOVE IT!