[Quiet Man Cometh]

I know they cross over each other. For instance, Vampires and Werewolves are enemies and something is said about it in each manual. The editions are all compatable with each other and I've seen different settings around, like Werewolf: Dark ages or Western.

Off the top of my head there is Werewolf, Mage, Vampire, Changeling, and a few more that I can't think of right now. They use a D10 success failure system. Role a number of d10s, beat a specific number, like 6 or so, a certain number of times to succeed at whatever you are doing.

Saw serentiy, never played.