Shawn Hayes

This plugin allows you to add useful quicktag buttons to the Text (HTML) mode of the WordPress WYSIWYG editor. There is a settings page to choose from a list of quicktags you would like to use.
Currently on the list of options are: p, br, h1, h2, h3, h4, h5, h6, pb
This plugin was written by Shawn Hayes at <a href="http://sharewebdesign.com/" rel="nofollow ugc">Share Web Design</a> to make it easier to implement useful quicktag buttons. If you have any questions please feel free to visit our contact page at <a href="http://sharewebdesign.com/contact-us" rel="nofollow ugc">Contact Us</a> or post a question in the support area at <a href="https://wordpress.org/support/plugin/simple-quick-tags" rel="ugc">WordPress.org</a>.

Simple Quick Tags

Simple Quick Tags allows you to add useful quicktag buttons to the Text (HTML) mode of the WordPress WYSIWYG editor via a settings page.

Daniele De Santis

WordPress Manage TinyMCE Editor allows you to add buttons to WordPress TinyMCE editor. 
Using the plugin you will be able to add the following buttons to the default WordPress visual editor:
Cut 
Copy 
Paste 
Source code 
Font family selector 
Font size selector 
Style selector 
Background color 
Empty document 
Superscript 
Subscript
Select the desired buttons in the plugin’s settings page and they will be available in TinyMCE.

Manage TinyMCE Editor

Add buttons to TinyMCE, WordPress' default visual editor.

Simple Quick Tags vs Manage TinyMCE Editor