M.Code

<h4>LET’S STICK THAT BAR AT THE BOTTOM FOREVER!</h4>
Natively WordPress doesn’t offer the possibility to change your admin bar position. With that simple extension you can stick it at the bottom forever and hide it by pressing shortcut!
<h4>Main features:</h4>
<ul>
<li>Stick admin bar to the bottom</li>
<li>Hide bar by pressing SHIFT + Down Arrow</li>
</ul>

Bottom Admin Toolbar

Thanks for this great plugin! It's the only "Bottom Admin Bar" plugin that actually does the job. Added to my default list :)

Simple and effective!

Stick the WordPress admin bar to the bottom of the screen. Hide it with SHIFT + Down Arrow keyboard shortcut.

gingerplugins

Want to display a notification about a promotion or a news? GP Notification Bar plugin lets you do that easily.
<h3>Features</h3>
<ul>
<li>Display a message with or without button.</li>
<li>Button will open a URL in same tab or in new window.</li>
<li>Position the bar on top.</li>
<li>Can be fixed at position (Sticky Bar).</li>
<li>Display on Scroll option.</li>
<li>Display a close button for the visitor.</li>
<li>Set the number of seconds before auto close.</li>
<li>Colors are fully customizable.</li>
<li>Set End date.</li>
</ul>

Notification Bar, Sticky Notification Bar, Sticky Welcome Bar for any theme

Easily it allows you to create a bar on top or bottom to display a notification or promotion

Bottom Admin Toolbar vs Notification Bar, Sticky Notification Bar, Sticky Welcome Bar for any theme