Cernocky

The Custom Post Styles plugin is an easy way to customize css of your posts individualy using CSS code. 
Plugin adds css editor box in your post editor.
See it in action: 
https://vimeo.com/179525212
Improve the user experience for your readers without having to change theme code.
<h4>Possible upcoming features</h4>
<ul>
<li>Better CSS editor</li>
<li>Custom webfonts</li>
<li>Supporting more post types</li>
<li>Custom styles for posts by categories, authors etc.</li>
<li>Visual editor</li>
</ul>

Custom Post Styles

Allows you to add custom css styles to posts.

Alex Prokopenko / JustCoded

This plugin allow you to create simple text variables (single/multi-line) to use them in your theme templates after that. 
Once you added at least one variable, a new page called Theme Variables will appear under the Appearance menu. 
You can move all your text data (like copyright text, phone numbers, address etc.) to variables. 
So if the final client wants to change this text, he can do this easily as admin without editing the template.
This project is also available on github.com: 
https://github.com/aprokopenko/justvariables.
You can post issues, bugs and your suggestion in Issues tracker there.

Just Variables

This plugin allow you to create simple text variables (single/multi-line) to use them in your theme templates after that.

Custom Post Styles vs Just Variables