flocsy

Authors Widget shows the list or cloud of the authors, with the number of posts, link to RSS feed next to their name, avatar. It is useful in a multi-author blog, where you want to have the list in the sidemenu. 
The widget can also display an “Author Cloud” if <a href="https://wordpress.org/extend/plugins/seo-tag-cloud/" rel="ugc">SEO Tag Cloud plugin</a> is installed.

Authors Widget

Authors Widget shows the list or cloud of the authors in the sidemenu.

skipstorm

A really simple plugin that allow users from a settable minimum level to add some text before and after their posts, this can be their adsense code or anything else.
Admin can set a default text, something to add before and after user text and the minimum level users can use this plugin.
Can also be useful for a multi user blog where you want to allow signatures as well as an adsense or anything else plugin for your blog.
<h4>Update v. 0.1.1</h4>
Added SK WP Settings Backup support

Authors Widget vs SK Multi User Ads