The Gaming Den

If you've ever played Mafia/Werewolf, you can play a version of it online for free at http://www.blankmediagames.com

Check it out, I've had some fun games with it.

Also EpicMafia. Whose page appears to be down right now, but as of at least a few months ago it was a thing.

Yeah, EpicMafia is pretty good too. This one seems to emphasize bigger games and graphics.