1) I want to develop a mobile application with open-source code for the Apple Store.
2) I want to find a team of developers.
Now that sounds good because we would love to try open source application and if it is useful then we may continue to use it on daily basis. But, I think that you aren't a developer yourself and you are somehow trying to find the developers for building that app for you. If you are ready to pay some good amount to the developers then you may get some developers in your team. I'm sure that there are many freelance developers who can make that app for you if you have money to pay them. You can find most of those developers on Freelancing sites and if you are lucky then you may find some of the developers on this forum, but still you'll have to pay those developers. I don't think that any of them would work in your team for free.