minimus

Adds little style sheet file and short code to blog for highlighting some portion of text in a post as colored boxes. 7 styles are available. That may be warning, alert, info and download styled portion of the post’s text.
If you need to explore the source code of plugin, you can find it on <a href="https://github.com/minimus/wp-special-textboxes" rel="nofollow ugc">GitHub</a>.
Available languages:
<ul>
<li>English</li>
<li>Russian</li>
</ul>
If you have created your own language pack, or have an update of an existing one, you can send .po and .mo files to me (minimus AT simplelib.com) so that I can bundle it into Special Text Boxes.
Real examples of outputs you can see on the <a href="http://www.simplelib.com/archives/wordpress-plugin-wp-special-textboxes/" rel="nofollow ugc">plugin page</a>
<a href="http://stb.simplelib.com/info/compare-stb/" rel="nofollow ugc">Compare feature set</a> of different editions of the STB plugin and choose exactly what you need.

Special Text Boxes

Highlights any portion of text as text in the colored boxes.

Valice

Banner alerts are custom alerts to notify your website visitors of promotions, alerts, events, etc. These display at the top of the website until they are dismissed by the visitor. Any new visitor who has not been to the website will see these until they are dismissed.
Banner alerts are configured just like a post or page with support for title, content, and excerpt. The plugin settings allow you to define which parts of the alert to display and whether or not to link to the full post. You can run more than one alert at a time and activate or deactivate as needed.
This plugin is ideal for:
<ul>
<li>Important operational changes</li>
<li>Technical notices</li>
<li>Time-sensitive appeals for donation or action</li>
<li>Terms or agreement changes</li>
<li>Privacy notice acknowledgements</li>
<li>Service outages or maintenance messages</li>
<li>Special offers or promotions</li>
</ul>

Banner Alerts

Provides an easy interface for creating and displaying alerts or notices as a banner on a website

Special Text Boxes vs Banner Alerts