In this paper, we present Gasp, a General Animation and Simulation Platform, whose purpose is to animate autonomous or userdriven agents, and we explain how it can be used for Collaborative Virtual Reality. First, we explain its architecture, based on the notion of simulation objects (or agents) associated with a calculation part (the behavior). Then we describe how it is possible to distribute efficiently our agents upon a network in order to share the amount of calculation between several computers. Finally, as the visualization of a simulation is also a simulation object, we show that our architecture allows us to distribute several visualizations upon a network to share a 3D interactive simulation between several users.