Lucy Tomas

This lightweight plugin will display a simple notification bar on the bottom of the page with a button to hide the notification.
<ul>
<li>Possible to add a ‘More Information’ button with a link on it. </li>
<li>All texts, colours and font size can be changed from a simple settings form.</li>
<li>Responsive.</li>
<li>Compatible with Polylang and WPML multilingual plugins</li>
</ul>

Simple Cookie Notification Bar

Displays a simple cookie notification bar on the bottom of the page, customizable colours and texts.

andrewcouch

A Peanut Butter Bar is all of the good stuff that sticks to the roof of your site.
The plugin allows you to attach sticky bars to the roof of your site that stays visible no matter how far a user scrolls.
<ul>
<li>Track clicks using Google Analytics Events using the Analytics you already use in your blog. </li>
<li>Plugin runs within your WordPress install. No external servers to deal with.</li>
<li>Close button state persists through a user’s session without cookies. </li>
<li>Responsive and mobile friendly. </li>
<li>Choose from a range of tasty colors. </li>
</ul>
This is the Smooth version of Peanut Butter Bar. It supports a single site-wide bar. The Crunchy (paid) version has more bits including multiple bars and attaching bars to specific posts/pages and categories. Learn more at <a href="http://peanutbutterplugin.com" rel="nofollow ugc">peanutbutterplugin.com</a>.
Check out this <a href="http://peanutbutterplugin.com/help-topics/filters-and-hooks-in-pbb-smooth/" rel="nofollow ugc">blog post</a> for the supported filters and actions in PBB Smooth.
<h3>Readme Generator</h3>
This Readme file was generated using <a href='http://sudarmuthu.com/wordpress/wp-readme' rel="nofollow ugc">wp-readme</a>, which generates readme files for WordPress Plugins.

Peanut Butter Bar (smooth version)

Peanut Butter Bar allows you to attach sticky bars to the roof of your site that stays visible no matter how far a user scrolls.

Simple Cookie Notification Bar vs Peanut Butter Bar (smooth version)