fedmich

This plugin will insert urls of JavaScript or CSS stylesheet files added into a particular posts or page via Custom Fields. 
The scripts (link stylesheet) tags will be then added in your tag 
It doesn’t require other plugin and it can be used as is.

Insert JS or CSS in post via Custom Field

This plugin will insert urls of JavaScript or CSS stylesheet files added into a particular posts or page via Custom Fields.

Samir Manjiyani

Mohammed Salman Khan

Add your custom CSS or javascript/jquery using “Custom WP CSS & JS” plugin to any theme without creating any extra CSS or JS files.
Benefits of Plugin 
* Easy to use. 
* Option to select placement (header or footer) to insert your custom JS. 
* Built with Syntax Code Highlighter. 
* Option to add custom CSS for WP Dashboard.
For Syntax Code Highlighter credits goes to <a href="https://codemirror.net/5/" rel="nofollow ugc">codemirror.net</a>

Custom WP CSS & JS

otimo

A lightweight plugin to add custom CSS, JS/Javascript to any theme. This plugin also gives you an ability to insert JS in header or footer.

Insert JS or CSS in post via Custom Field vs Custom WP CSS & JS