Eetheart

<p>Use this plugin for developing and/or editing your theme. You can access the .js file to add your custom JavaScript.</p>


Eetheart Functions

neoslab

<p>Powered Minifier allow you to reduce your page load and increase your performance by minifying your HTML source along with all the CSS and JS code present in your markup.</p>
<h3>License</h3>
<p>Good news, this plugin is free for everyone! Since it’s released under the GPL, you can use it free of charge on your personal or commercial site.</p>


Powered Minifier

Honestly it's the best minifier plugin for Wordpress 

Simply Excellent

Reduce your page load by minifying your HTML source along with all the CSS and JS code present in your markup.

Eetheart Functions vs Powered Minifier