RPTools (Score 1)

You might also check out Role Playing Tools (rptools.net), it has the following tools to aid in your gaming:

MapTool - virtual tabletop
DiceTool - powerfull dice rolling
InitiativeTool - Encounter management
TokenTool - easily create avatars from any image

All tools are written in Java and are completely free. Development is very active and new feature requests are always welcome.