This plugin will integrate AJAX commenting feature into your WordPress Blog. It uses the powerful JavaScript Framework jQuery to handle AJAX requests and jQuery Validation plugin by bassitance.de to validate comment form on the client side.
<h4>Feature Summary</h4>
<ul>
<li>Enable AJAX Commenting</li>
<li>Client Side Form Validation</li>
<li>Easily rolls back if JS disabled</li>
<li>Easily configure custom styles for messages</li>
</ul>
<a href="http://webdeveloperplus.com/wordpress/new-wordpress-plugin-wdp-ajax-comments/" rel="nofollow ugc">See plugin page for more details</a>

WDP AJAX Comments

This plugin will enable AJAX comment posting on your WordPress blog.

johnibom

Welcome to WP Custom CSS JS by PieSolutions. 
So you want to add HTML, CSS, Javascript, Jquery or Tracking Pixel on your Website without messing up with your theme’s files? This small and light weight plugin gives you ability to do that right from the wordpress dashboard.
=Features=
HTML (All tags are supported) in the header Block
Inline CSS in Header
Inline JS/jQuery in Header
HTML (All tags are supported) in the footer Block
Inline CSS in Footer
Inline JS/jQuery in Footer
<h3>LOCALIZATION</h3>
<ul>
<li>We are looking for translators. Please reach out to us and/or translate this plugin to your own language here: https://translate.wordpress.org/projects/wp-plugins/wp-custom-cssjs</li>
</ul>

Custom CSS/JS

WP Custom CSS JS plugin allows you to add any HTML, CSS, Javascript, jQuery or Tracking Pixel easily on your wordpress site right from your dashboard.

WDP AJAX Comments vs Custom CSS/JS