FREEAfter installing this browser app, your images on Google+ will come alive. As you hover them with your mouse, you will be able to preview larger versions of themselves.
FREEPost Google+ status updates to Facebook simultaneously.
FREEGoogle Plus Blocker allows you to selectively block other people form your feed.
FREEGoogle+ Direct shows you the number of people a message was shared with and highlights messages to 5 or fewer people.
FREEFixed Position Notification Bar for Google Plus