Milan Dinić

This plugin automatically disables frontend database query for Custom CSS and Customizer section for setting Custom CSS, without need to manually choose any setting or option.
It is a very lightweight, it has no settings, just activate it and it works immediately.
And it’s on <a href="https://github.com/dimadin/disable-custom-css" rel="nofollow ugc">GitHub</a>.

Disable Custom CSS

Disable frontend database query and Customizer section for Custom CSS.

wpwox

This plugin provides custom meta boxes in default Pages and Posts of wordpress where you can enter any scripts for each respective pages or posts, for example:
<ol>
<li>Google Adwords conversion tracking</li>
<li>Google Adsense ads</li>
<li>Any Javascripts</li>
<li>Page/post specific CSS codes</li>
<li>Normal HTML codes</li>
<li>Unlimited possibilites</li>
</ol>
You will get a meta box under each of page and post. The Meta box will have 4 Text Boxes, in each section you can add codes for:
<ol>
<li>Before Content Field</li>
<li>Below Content Field</li>
<li>Scripts to add in tag</li>
<li>Scripts to add in footer below tag</li>
</ol>
Plugin Documentation: 
http://www.wpwox.com/wp-plugin/custom-script-integration/

Custom Script Integration

This plugin provides custom meta box to add Google Adword conversion, ads, custom css and scripts in individual pages/posts.

Disable Custom CSS vs Custom Script Integration