Christoph Daum

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 <a href="https://github.com/apermo/apermo-adminbar" rel="nofollow ugc">head over to GitHub</a>!

Apermo AdminBar

Every professional WordPress developer should have at least two environments when working on projects: development and production. But how often do you find yourself lost in these environments? @apermo done a great job solving this issue with this plugin. 

Conclusion: I can highly recommend this fantastic plugin!

Fantastic plugin!

This plugin helps tremendously if you want to switch between different versions of the website. (Staging, dev, live, etc.) 

Thank you!

Good Helper

This plugin allows you to add links between a development, staging and live version of your website, and adds them to the AdminBar.

Jeremy Saxey

Easily hide or show the front-end WordPress Admin Toolbar with a click of a button. The plugin adds a special button to the right side of the WordPress Admin Toolbar that only displays when you are outside the admin area of WordPress on the front-end. Clicking it will make the admin bar slide off the page to the top left corner, leaving only the hide/show button visible. Clicking the button again will restore the Toolbar to its original position. The shown/hidden position is remembered between page visits so that it can be kept hidden away until you are ready to bring it back.
There are no options or configuration. Just install and activate the plugin. When you exit the admin area, you will see the button to the far right of the Toolbar.
I actually like the WordPress Toolbar. It’s a convenient way to go back and forth from the admin area to the public website. However, when I’m doing design modifications for a theme, the Toolbar can be visually distracting. I wanted a quick way to hide the WordPress Toolbar when needed, but otherwise keep it around. I tried several plugins but they didn’t work as I wanted or didn’t even work at all in some cases. So I decided to build my own.
<h4>Contributions Welcome</h4>
This plugin is on Github. <a href="https://github.com/jr00ck/hide-wp-toolbar" rel="nofollow ugc">Submit a pull request</a> if you’d like to contribute.

Hide WP Toolbar

I had tried several plugins that this was the one that has the toogle feature that I love

Unique

Easily hide or show the front-end WordPress Admin Toolbar with a click of a button.

Apermo AdminBar vs Hide WP Toolbar