The technical demo for Black Isle Studio's Van Buren (cancelled Fallout 3)
"Van Buren was the codename given to Fallout 3, a game that was being developed by Black Isle StudiosInterplay Entertainment, laid off the PC development team on December 8, 2003, effectively cancelling the game. Prior to its cancellation, before the parent company, Van Buren was set to carry on the Fallout series as the sequel to Fallout 2. On May 3, 2007, the tech demo of the game was leaked onto the internet.
An official Fallout 3 was developed by Bethesda Softworks after Interplay sold them the single player rights to the franchise. It was released October 28, 2008. Some of the story elements from Van Buren were later used in Fallout: New Vegas, on which some of the Van Buren development team members, like Chris Avellone and Josh Sawyer, also worked on."