Enhance your Google+ Photo experience with the Daily Themes Chrome App. Google+ is full of great photos and this application makes following daily photo themes a lot easier.
The Hangouts API provides the programming interface to Google+ Hangouts. It provides a JavaScript interface that enables your app to do such things as list the hangout participants, share data between instances of your app in the hangout, control some aspects of the user interface, and control the microphone, camera and speaker settings.
The Google+ PowerApp lets you add a person to your circles right inside your emails. The app shows you a short summary of the particular user associated with that email, and lets you check off which circles you'd like them to be added to.
This hangout app will display a simple WebGL room and place an avatar for each participant in the room. The location/orientation of each participant is synced via the shared state of the hangout, so that everyone can see where the others are. There's also some basic collision checking.
Hangout Captions is an app that connects live transcription services directly into a Google+ Hangout, improving accessibility for participants who are deaf or hard of hearing.
The Google+ API is the programming interface to Google+. You can use the API to integrate your app or website with Google+. This enables users to connect with each other for maximum engagement using Google+ features from within your application.
G+me is a Google Chrome browser extension that enhances the Google+ web app to make it much easier to process a large stream of incoming posts and comments and to unlock the potential of Google+'s real-time updates.
This initial release is intended for feedback and learning - they are restricted to a courtesy usage quota and some functionality is disabled. This should provide enough access for you to check out the APIs and to start integrating Google+ with your apps. You can request more quota at the Google+ API Console.