I am playing TTRPG remotely. For this, I was using far.app, a js app, which permit to link Game Master and Players in order to share Character sheets, dice roles, some index cards (set up as a “scene”).
Would you know an open-source software that I could self-host to basically have a board with multiple users at once.
You probably already know, but FoundryVTT is pretty fantastic. The software/base VTT itself is not open source, but the rule systems and modules (QOL add-ons) mostly are. I self host my own server.