GM's of medieval and fantasy tabletop RPGs (regardless of rule system) should check out this Kickstarter campaign. Whether you play face-to-face or use virtual tabletop software, if you like to make and use dungeon maps in your campaigns, this should appeal.
The campaign is ending soon (27 hours), and it looks like it's going to be a very close thing. I'm hoping the new pledge level announced in Update #4 will help. The campaign is just $137 away from funding.