I’ve been playing around with OpenRPG a little bit lately, and it seems to work reasonably well. It provides multi-user text-based chat, a shared map with miniatures, an a few other things useful for people playing pen-and-paper adventure games online. On problem that the current 1.6.1 release has is with the fog feature: in 1.6.1 there is a bug that causes massive instability when the fog feature of the map is used. However, there is a patch for it that fixes the problem.