jgwhite33

Allows you to insert a listing of related Amazon products, on the single post page by using a custom field called amazon_search and inserting simple code in your template file. 
The listings are completely customizable according to parameters defined in the admin panel. If you include an Amazon Associate ID, you can even earn commission! Also allows you to share revenue with your authors on a multi-author blog. Whoever wrote the post gets credit in the listings. Creates a custom field on the author profile pages so they can input their campaign ID. Whoever wrote the post gets credit in the listing.
A few of the features:
<ul>
<li>Specify the search with a custom field in the post called amazon_search</li>
<li>Allows you to use the Amazon Associate Network</li>
<li>Allows multi-author blogs to share revenue, you can even specify the percentage to share</li>
<li>Can share revenue with the author of the post if you desire</li>
<li>Uses advanced search parameters</li>
<li>Display is easily customizable</li>
<li>Hides the affiliate link to Amazon</li>
</ul>

WP Amazon Ads

WP Amazon Ads - allows you to easily insert Amazon product listings into your WP posts, and earn commission from sales.

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.

WP Amazon Ads vs Authors Widget