I'm searching for a site that will help me to design a game. I don't have a development team in the same location. They are all located somewhere over the world. I am searching for a kind of site that allows people to post ideas and suggestions, but moreover to have control over who has the control over what. For example, one makes the graphics and has several people "under" him that can get a certain task to make a certrain graphic. This has to be easily found on this site.
Does anyone know a good site like this? I prefer it to be free.