Hi all,
I'd like to share an open-source project which implements nearly all features of the google drive realtime api.
Google Drive Realtime API provides Google Docs–style instant collaboration. It lets multiple people edit the same data(JSON format) simultaneously.
This project was inspired by Google Wave, the server runs on vert.x,
and has native Android/iOS/JavaScript client libraries. Just like the official approach, the js library is translated by GWT's JsInterop, the Objective-C library is translated using J2ObjC.
There is also an Objective-C client library for iOS and Mac OS X, but it is not yet fully tested, use at risk.
Enjoy!