What began as a simple attempt to clone Team 17's Worms Armageddon has evolved into one of the most polished and community driven libre game projects on the scene.
Um, actually, Hedgewars started as a Worms World Party clone:
http://hedgewars.org/devs
In 2004, unC0Rr wanted Worms World Party with additional features, the result, of course, was Hedgewars.
But I admit, Worms: Armageddon and Worms World Party are both very similar and it's easy to confuse the two.