Dissendium's Quidditch 3D (23+ Mb)
Description:
Aerial Hockey (!) atop mounted broomsticks with an ovaloid lifeform serving as a Puck.
Wikia.com describes the finer points of Quidditch here:
http://harrypotter.wikia.com/wiki/Golden_Snitch
I ran the game on Windows 7 (without installing the additional soundtrack) and it looks good.
Homepage [Last Updated on October 31, 2010]:
http://www.dissendium.com/
Fansite & Download Link:
https://quidditch3d.wordpress.com/
Screenshot: