Marc Tönsing

Ipstenu (Mika Epstein)

This plugin displays the most basic of quicktag buttons on your comment forms, using the Quicktag API built into WordPress (as of 3.3). No jQuery needed.
Contribute on <a href="https://github.com/mtoensing/marctv-quicktags" rel="nofollow ugc">GitHub</a>.

Simple Comment Quicktags

Simple and clean

Make commenting easier with bold, italic, add link and quote buttons on top of the form.

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.

Simple Comment Quicktags vs Simple Quick Tags