Preservation of video games has taken a huge step with the release of 700 PS2 titles. The Hidden Palace, the group responsible for this release, has shared with the community PS2 game prototypes, early builds, E3 demos, preview versions and other rarities.
Maybe you remember the Shadow of the Colossus build presented at E3 2005:
This is part of the goods included here. All this material was collected, sorted and copied by one anonymous person.