Abhik

The Plugin stops the stripping of html formatting from the description (bio) field and sanitize content for allowed HTML tags for post content. Once you put this up, you can go and use all the HTML formatting allowed in posts in author?s bio. Pluginized by <a href="http://www.itsabhik.com" rel="nofollow ugc">Abhik</a>. Add me on Circles on <a href="https://plus.google.com/106671843900352433725?rel=author" rel="nofollow ugc">Google +</a>.

HTML in Author Bio

Enables the use of HTML formatting in Author Bio

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.

HTML in Author Bio vs Simple Author Bio