The fine folks over at /g/ are working on a GTA inspired top-down  where you play as RMS. Team up with Richard Greenblatt, Tom Knight, Bill Gosper, Eric S. Raymond and, Linus Torvalds and fight the evil Corps like Microshaft and, Crapple.
Well, that’s the plan. Right now it’s little more than a functional prototype but check out the TODO for a taste of what’s to come.
rest here 
Also: Half-Life 2 Single Player Coming