Using something like Chameleon can get you up and running in a very short time. Literally, it took one afternoon for me to get our app running on Chameleon. Tru

Using something like Chameleon can get you up and running in a very short time. Literally, it took one afternoon for me to get our app running on Chameleon. True story. I actually did it without management approval on the day they said "we should have an OS X app" and demoed it to them at the end of the day. It wasn't perfect, and took another week or two to iron out a few bugs in Chameleon we ran into. That was the start of our fork, actually. But it worked, and it would have taken two to three months to get to that point from scratch. I should know, because I did from-scratch ports to other platforms and that's how long it took each time. You can mix and match Chameleon (UIKit) and AppKit in the same application, so you can incrementally replace Chameleon with a "proper" solution. If you find that's important to you.