Bastien Ho

NOUS Open Usefull &amp; Simple

This plugin is for you if :
<ul>
<li>You know CSS, but don’t have legitimacy to apply it</li>
<li>You manage a multisite network</li>
<li>You work with webmasters which want to customize WP but think that “CSS” means “Custom Super Style”</li>
<li>You just want to use predefined styles on your blog</li>
</ul>
This plugin works as well for standard single site or multisite network.
Checkout full examples and documentation on <a href="http://css-addons.avecnous.eu/" rel="nofollow ugc">css-addons.avecnous.eu</a>
The power user can create a set of CSS rules readable for humans with :
<ul>
<li>Slug</li>
<li>Name</li>
<li>Theme</li>
<li>Descrition</li>
<li>CSS code</li>
</ul>
It adds the list of addons in the customizer view (under appearance) and webmaster just have to check the ones they want with live preview. 
That’s it. 
For coder webmasters, a free field let them put there own CSS in a code-highlighted editor.
Predefined librairies are also available:
<ul>
<li>Bootstrap 3/4</li>
<li>GithubCSS</li>
<li>Knacss</li>
<li>MarkdownCSS</li>
<li>Normalize</li>
<li>Skeleton</li>
<li>YUI 3</li>
</ul>
<h3>Languages</h3>
<ul>
<li>en : 100%</li>
<li>fr_FR : 100%</li>
</ul>

Custom CSS Addons

Description: Lets administrator add CSS addons to any theme

FRESHFACE

Create custom CSS and JS codes. Delivered with our awesome Conditional Logic, you can easily specify 
where you want to your custom CSS code appear. You can write your CSS and JS codes inside 
nice ACE editor with syntax highlighter.Codes will be still presented, after you change the theme, 
so this is really good way to write CSS adjustments into your theme.

Custom CSS

Although this plugin does what it's supposed to I don't want to keep clicking the "buy pro version" button because it is the same color and exactly below the standard WordPress update button in the Publish metabox.  Putting it in that spot with that color is deceptive, if your plugin is good and useful people will upgrade to pro naturally, you don't need to trick anyone into clicking - this isn't SEO!

Pro version promotion over the top

Worthless. Just trys to force you to buy the 100 version

Worthless as a free app

No way to add ANY custom code, but there is a huge "upgrade to premium" button.

Add custom CSS, JS, PHP, tracking code. Very easy to use!

Custom CSS Addons vs Custom CSS