Ransom Binary / unFun Games are working on a game development kit (for Mac and PC) that works as an MMO. You can build games online with other people, put them in virtual arcades, etc. The games can be played in the MMO (called Game Dot Life) or played stand-alone. There's a bunch of info on the kickstarter page.

http://www.kickstarter.com/projects/1234...e-dot-life

It's a unique idea and should be a great toolkit for people wanting to make games and get them distributed to the masses.