The people over at http://www.segasaturno.com have posted a few saturn prototypes that they have and want to release if people donate money.
1) Chill - an unreleased snowboard game.
2) Alpha-version of Virtua Cop 2.
3) Newer prototype of Werewolf the Apocalypse.
For more information check out the thread here: http://www.segasaturno.com