I wonder how difficult it would be to convert TripleA into a HTML5 format or for GameMaker Studio. From there is should be fairly easy to generate an async. multiplayer game that is scalable and convertable to different devices. People could also host it on there personal website.
Concerning HTML5/WebApp I remember somehow related discussions on Github, see:
https://github.com/triplea-game/triplea/issues/284
https://github.com/triplea-game/triplea/issues/1613