While some decent examples have been provided in another response, it is kind of telling when most Libre/open multiplayer FPS titles are still built on Quake 3 engine. And they are not exactly to most vibrant communities. But it will run on almost anything form the last 20 years I guess.
I think a part of it is that the video game industry is good at absorbing a lot of people with talent. Game folks are at the intersection of arts and technology but it also isn't firmly in either camp, so people can be poached away fairly easily from open projects if they have a lot of talent.
I think a part of it is that the video game industry is good at absorbing a lot of people with talent. Game folks are at the intersection of arts and technology but it also isn't firmly in either camp, so people can be poached away fairly easily from open projects if they have a lot of talent.