Quake, while not the first multplayer FPS, is a classic that spawned many copycats as well as having its engine being used for a great deal of games. Take a look at
this family tree and you'll see a lot of titles that spawned off of this iD classic. I forgot about some of the ones that are on the tree and it's really cool to see how
Quake had its hand on some great, great games.
Thanks
Digg.