DoodleKit
Social drawing for iOS devices.
DoodleKit manages up to four users drawings on a single canvas, allowing doodlers to create and share content across their devices.
This is a drop-in framework that handles the drawing and p2p networking for you without any dependency on GameKit UI. In fact, we highly recommend that you avoid GameKit as much as possible.
A demo app, Doodle Party, is included in the repository.
Developed with care and exhaustion at iOSDevCamp 2013.