I've been playing around with Carthage since I found out about it, as it seemed like a slightly more elegant solution than cocoapods, so thought I'd share a small helper gem.
So check out motion-carthage over on GitHub. Pull requests welcome
Currently the creation of the Cartfile and running
carthage update|bootstrap are up to the user and then you add the built framework name to
app.carts in your Rakefile. This embeds the built products into the bundle for iOS Simulator and Mac apps, and deals with
carthage copy-frameworks to remove unnecessary architectures for iOS Device builds.
I have uploaded a sample app to show this in action.