Masterplan is an adventure planning / campaign design tool for Dungeons & Dragons (4th edition).
When you're preparing a D&D 4E game, what do you need to do?
Whatever your answer, Masterplan helps with that.
You can also use Masterplan during game sessions, displaying all sorts of game information to your players, such as:
It's free, and you can download it here. You do not need a DDI subscription to use Masterplan.
Feedback, feature requests, bug reports are welcome, via email, blog or Facebook. If you find Masterplan useful, please tell everyone you know! If you find it useless, please tell everyone anyway, but lie.