D&D DM game for PC

I know I had seen the game in a video Tek syndicate had done a while ago I think while they were at gamescon but can't find it again. It was set up kinda like MyRPGMaker for the DM to layout the campaign or dungeon visually and had a different view for the DM than the players.

Thanks in advance for any help in finding it.

Roll20 was it?

Deff was Roll20 great site.

Sword Coast Legends maybe.

Not only am I 100% certain that the crew have mentioned Roll20 and seemed to like it, I can personally verify that it's beyond great. :)