IMAGE is a game system that Spax Orion of Ozone grid is working on with a view to making it available for free to other opensim grids.
The name is an acronym for 'Image Matrix Action Game Engine' and right now it's up and running but needs people to come over and try it out so that any remaining bugs in the system can be worked out.
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So, ask yourself, could you 'sacrifice' a bit of time by going to sim Atrius, playing a shoot 'em up game, and then giving honest feedback, so that the IMAGE project can reach the stage that it becomes shareable?