FoundryVTT is a high quality virtual online tabletop platform. Unlike Roll20, however, there’s not a central server — once you buy a license, you have to run it someplace. There are a few services that will do this for you at a reasonable price, but I’m a geek, so if I start using FoundryVTT I want to host it myself.
Fly.io is a very cool new application hosting cloud. I experimented with it a month ago for hosting an NJPWWorld RSS feed generator and it was awesomely simple. They support persistent disk, so I couldn’t see any reason why it wouldn’t work for FoundryVTT. And it did! Details after the cut.