Tristan Network

Foundry is my favorite virtual tabletop, even if I wasn't considering the fact that you can self-host it. The alternative for me was roll20.net, and the difference between the two is like night and day.

Not only are there way more cool features in Foundry, but there's also many open source mods you can use to enhance your gameplay. In my opinion, it is well worth it to buy and host Foundry if you're into that sort of thing lol.