Saying that the only difference for these big projects is their license, seems quite a bit simplified. How is the contribution process organized? How willing a

Saying that the only difference for these big projects is their license, seems quite a bit simplified. How is the contribution process organized? How willing are the developers to incorporate foreign extensions? There a quite a few factors that determine how such big projects work and at the end it's IMHO always the people involved that make the difference.