MIT study

Dear Sirs in a study by the MIT (Massachusetts Institute of Technology) we are looking for innovative design solutions in the game industry. Specifically we are looking for a web site where a game producer offers his customers kind of a toolkit that enables the users to create their own games. This game then might be exchanged with other users or being marketed by the producer. One example of course is Yaroze. My question: do you know any sites or game producers that offer their user such a feature? It would be great if you could give me a hint for it is not easy to find examples. Thank you in advance and best regards, Nik Franke