A web app Dungeon Masters can use on their phones/computers to help run a game. I built this (am building it) to help me learn the ropes. It walks the user through gameplay, providing content and tips along the way. I wrote it in QnA Markup, and you can see, edit, and test the code in the online editor here. Also, the QnAMarkup source can be found in the qna
folder. See https://github.com/colarusso/dm/blob/main/qna/DnD_QnA.txt
The app can be found at: https://colarusso.github.io/dm