I backed and have been a huge supporter of Tabletop Connect since I first heard about from I believe +Moe Tousignant. Recently the map editor was made available for the beta testers and I must say it is quite awesome. I suck at it, but it is quite awesome. It reminds me of an easier version of the old modders kit from Neverwinter Nights (of which I used to play with and create modules). The controls took a bit to get used to but as this video shows it makes for some fun design. I am eagerly awaiting release so I can subject will participants to the dark dungeons that float in my head.
Tabletop Connect Map Editor DEMO (my apologizes, they won't let me embed)