This app was mentioned in 2 comments, with an average of 1.00 upvote
I've got an app . Some points to remember:
I used it to quickly grasp some address with gps coordinates and pinpoint it on a map
I've used the Google sign in button (not the Google+) and Google App Engine with Google Cloud Endpoints for backend in my recent project. (my app )
The implementation was pretty straightforward. The only fact I hate is that there is no support for any other authentication than using Google account.