DigitalTweaker

** No Longer Supported ** 
DT Author Box is great for those who have multiple authors on a WordPress site and want to show author information at the bottom of every post for each author like a signature. This can include an image, a short bio, a link to the author’s website and their social profiles.
<h4>Social Profiles Added</h4>
<ul>
<li>Twitter</li>
<li>Facebook</li>
<li>LinkedIn</li>
<li>Google+</li>
<li>YouTube</li>
<li>Pinterest</li>
</ul>
<h4>Language Support</h4>
<ul>
<li>German</li>
<li>Spanish</li>
<li>French</li>
<li>Indonesian</li>
<li>Italian – Thanks to Marco Pegoraro for accurate translation</li>
<li>Portuguese</li>
</ul>
Language translation may not be exact, Google Translate was used. If you find any errors, please let me know.
<a href="http://www.digitaltweaker.com/web/wordpress/2012/04/digital-tweakers-author-box-plugin-for-wordpress/" title="DT Author Box Plugin Home Page" rel="nofollow ugc">DT Author Box Plugin Homepage</a>

DT Author Box

Easily add an author box bio signature with custom profile image and social profile buttons to the end of each author's posts

David Anderson / Team Updraft

This plugin adds a configurable signature to all outgoing emails from your WordPress site.
<h3>License</h3>
Copyright 2012- David Anderson
MIT License:
Permission is hereby granted, free of charge, to any person obtaining 
a copy of this software and associated documentation files (the 
“Software”), to deal in the Software without restriction, including 
without limitation the rights to use, copy, modify, merge, publish, 
distribute, sublicense, and/or sell copies of the Software, and to 
permit persons to whom the Software is furnished to do so, subject to 
the following conditions:
The above copyright notice and this permission notice shall be 
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, 
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Add Email Signature

This plugin adds a configurable signature to all outgoing emails from your WordPress site.

DT Author Box vs Add Email Signature