Armel

AP Twitter Follow Button add a widget which allows you to add a highly cutomizable Twitter Follow Button.
<h4>Features</h4>
<ul>
<li>[NEW] Option to set the alignment of the button</li>
<li>[NEW] Option to use iframe instead of Javascript</li>
<li>Option to choose the language of your button</li>
<li>Option to show the number of followers</li>
<li>Option to show the username</li>
<li>Option to activate the large button</li>
<li>Option to activate “Opt-out of tailoring Twitter”</li>
<li>Option to prevent the Twitter <code>widgets.js</code> javascript file from loading</li>
<li>Option to set a maximum width for your widget</li>
</ul>

AP Twitter Follow Button

AP Twitter Follow Button add a widget which allows you to add a highly cutomizable Twitter Follow Button.

antonpug

This plugin adds a customizable Better Follow Button at bottom right corner of your Jetpack-powered WordPress.org site.
The plugins integrates with the built in subscription manager of the Jetpack Plugin to collect the email of the subscriber and handle distribution of new posts via email.
NOTE: This plugin requires the Jetpack plugin to be installed & activated
For further information visit the plugin website.

Better Follow Button for Jetpack

Adds a floating subscription button (like on WordPress.com sites) to Jetpack-powered WordPress.org sites.

AP Twitter Follow Button vs Better Follow Button for Jetpack