likeagency

This plugin allows you to add a widget with custom text, link and a FontAwesome icon. In order for this plugin to work, please make sure you already use FontAwesome toolkit in your theme.
List of features:
<ul>
<li>Choose FontAwesome icon as an image for the button.</li>
<li>Add your own text and title for the widget.</li>
<li>Select header tag for the title.</li>
<li>Customize your FontAwesome image (position, color and background color).</li>
<li>Add custom URL to use the widget as a link.</li>
<li>Add extra button displayed below, with your own text.</li>
<li>The widget has its own stylesheet included, however with just necessary CSS to be displayed properly, so it doesn’t override the style for any theme you currently use. </li>
<li>You can also add your own CSS for this plugin via its Settings page.</li>
</ul>

Button with FontAwesome icons by LIKE.agency

This plugin allows to add a widget with custom text, link and a FontAwesome icon.

robbychen

A simple way to create buttons with many customizable options available. After a button is created, you can use a Simple Buttons Creator widget to display the button onto the page. This plugin has been tested with <a href="https://wordpress.org/plugins/siteorigin-panels/" title="Page Builder WordPress plugin" rel="ugc">Page Builder by SiteOrigin</a>.

Simple Buttons Creator

A simple way to create buttons with many customizable options available.

Button with FontAwesome icons by LIKE.agency vs Simple Buttons Creator