Mafia - Werewolf: Online play
I'm the creator of https://werewolv.es which is an in-browser version of werewolf. The games are more like individual chat rooms or slack/irc channels than the usual forum/message board variants you find online. Most of the games on the site take place over several days, but plenty of 'speed games' are played where the rounds a few minutes.

I decided to embrace the online aspect of this version of the game and added features that would be difficult or impossible to simulate in face to face play. Each game is played with a distinct theme (usually taken from a film or tv series) and players are given a random avatar in addition to their role. This gives a degree of anonymity (at least at the start) to the game. 

The anonymous avatars also allow for additional avenues of play. For example, the Puppetmaster has control of 2 extra identities in the game, and can freely talk as them, allowing the Puppetmaster to counter claim and cause confusion in chat.