Blood Bowl is one of Games Workshop’s smaller games, but its been around for as long as I can remember. Here’s a Bloodbowl variant that uses the game to play European "Football" — soccer.
Here’s a variant for Games Workshop’s BloodBowl Game in a hockey format.
Heresy Miniatures offers a set of free miniatures rules called Deathball. There’s also an arena for you to download.
In Deathball, the authors write:
The team’s objectives tend to revolve around the placing of heads and the inflated organs of sacrificial victims into stone goals or onto mighty altars, while at the same time killing and maiming as many of the opposing dark lord’s fighters as possible. In Deathball, deaths are frequent and spectacular: the ‘ball is always the secondary consideration. It is the roar of the crowd, that greets the players with howls of lust and fury as gold changes hands; the laughter of the Dark Lords as another creature is slaughtered; the thrill and relief of surviving; this is what Deathball really is!
Guildball is a new entry in the well-travelled genre of fantasy sports games.
I have often wondered: where are the fantasy golf games? Given that the sport was invented by Bullroarer Took, when he hit a goblin head into a hole, it seems a natural.
Deathball is a set of one page rules for combat oriented football games. The authors write:
Deathball is a fast paced and brutal sports game inspired by others such as Dreadball and Blood Bowl. Challenge your friends in a match of this violent sports contest where a well-placed pass is just as important as a well-placed punch.