laura20

This plugin adds eight functionalities you can add after all post content:
<ul>
<li>Post pagination</li>
<li>Related content</li>
<li>Author info</li>
<li>Social sharing buttons</li>
<li>Custom post meta list</li>
<li>Custom text</li>
<li>Custom image</li>
<li>Banner</li>
</ul>
You can turn on / off each functionality in one click. You will find an advanced setting page for easy customization on the wordpress menu.

After Content

Adds post pagination, related content, author info, social sharing buttons, post meta, text, image and banner after posts content.

jmarreros

This Plugin shows author’s biography in the foot of the posts, also adds 
social networks and a link to see all the entries written by the author.

Simple Author Bio

Plugin that shows the author's biography in the foot of the posts.

After Content vs Simple Author Bio