The Double Fine Amnesia Fortnight process is going on again this year, only this time they are making the whole process public through a Humble Bundle. If you pay a minimum of $1, you'll get to vote on which game pitches Double Fine will turn into prototypes. There are all kinds of game styles available to choose from in the pitches, from puzzle games, to platformers, to action adventures, and even a text adventure! The four pitches with the highest number of votes will be made into prototypes in a two week period.
Everyone who donates $1 or more will get access to the four chosen prototypes and also get downloads of two prototypes from the first Amnesia Fortnight that were made into games: Happy Song (which became Sesame Street: Once Upon a Monster) and Costume Quest.
If you donate more than the average (currently at just under $7 USD), you will also get a prototype of Brazen, a Monster Hunter inspired game with Ray Harryhausen inspired stop motion animation.