I always thought it was bizarre that there's no serious selfhostable FOSS virtual tabletop software [1]. The overlap between the two communities is very large and passionate. Foundry is selfhostable but it's a clunky proprietary node.js application and there's a ton of janky UI issues. Roll20 is far worse. I presume that this Diceright project is better since it's actually using a canvas. But why doesn't someone just…
Foundry's upside is that it's extensible (modules), which increases traction and nurtures a community.
Most of the FOSS attempts will probably die if they won't take that approach (extensibility that is).