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.

bmsterling

This plugin adds more buttons to the non-visual editor view for creating/editing posts/pages
Currently adds: 
* h1 
* h2 
* h3 
* h4 
* h5 
* q 
* cite 
* sub 
* sup 
* dl 
* dt 
* dd
<h3>Credits</h3>
Copyright 2012 Benjamin Sterling (benjamin.sterling@kenzomedia.com)
This program is free software; you can redistribute it and/or modify 
it under the terms of the GNU General Public License, version 2, as 
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
GNU General Public License for more details.
You should have received a copy of the GNU General Public License 
along with this program; if not, write to the Free Software 
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Quicktag Extender

This plugin adds more buttons to the non-visual editor view for creating/editing posts/pages

Simple Comment Quicktags vs Quicktag Extender