I set up a real time board game maker online, called DoomGrid[0]. It's very basic and just uses Firebase to sync a bunch of game objects across everyone's game board.
We also published the rules for our invented game recently[1] (warning, only 70% complete). We've now spent over 10+ hours developing those rules and the story behind them.
If you haven't tried inventing a game yet, I'd highly recommend it. It's really fun! I personally enjoy it just as much as actually playing the finished game. And it's very rewarding the play something you crafted from scratch.
[1] https://docs.google.com/document/d/1GBGlrMk4By5IZ28yCqq3vHAo...