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 use a proper game engine that can target the web (with wasm/emscripten/etc)? You're making a game after all, and it would mean that people who are happy downloading and running a native application locally for better UX would be able to.
[1] edit: That I was aware of when writing this comment initially.
[1] edit: That I was aware of when writing this comment initially.