This plugin enhances the AdminBar and adds links to development, staging and live version of your website, furthermore it allows you to choose a color scheme of your AdminBar for all users on a website, including the frontend. You also have to option to control the robots.txt visibility settings, in the newest version you get a watermark for posts that are in draft or scheduled, and a keyboard shortcut to hide the adminbar.
If you want to participate in the development head over to GitHub!