thedannywahl

My Posts simply adds an extra link under ‘Posts’ that takes the user directly to a list of posts authored by them. This is a great time-saver for multi-user and multi-author blogs. It works for any user with the ‘edit_posts’ capability.

My Posts

Add 'My Posts' to the admin menu. Perfect for multi-author blogs.

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.

My Posts vs Authors Widget