Taylor Marek

Customize what kind and where your ‘Call To Action’ box should be located.
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Forget trying to attract an audience through interruption-based marketing (popups, slide-ins, bars, random text, etc.). It doesn’t work. Visitors would sooner leave than be bombarded by those kind of ads.
This plugin is what you’ve been searching for and features everything you need to customize to your taste.
At its core, this plugin was designed to flow with your blog theme and provide your audience with a ‘call to action’ when they get to the end of your blog post. Obviously, you want them to “do something” after they have read your post, right?
Be sure to follow <a href="http://twitter.com/taylormarek" rel="nofollow ugc">Taylor Marek</a> on Twitter if you need support!

Call To Action Plugin

Easily add a Call To Action Box to your WordPress blog!

Debashish

Author Spotlight widget displays the profile of the author(s) with Social links (example: Twitter, Facebook) and his/her profile picture or Gravatar on any post or page that has an Author. The widget automatically detects the current author(s) of the displayed post or page; just drag and drop the widget on your sidebar and you are done.
To display a custom photograph with the Author’s Profile you may install the <a href="https://wordpress.org/extend/plugins/user-photo/" title="User Photo WordPress plugin" rel="ugc">User Photo</a>. In absence of this plugin the widget will fall-back to displaying the Gravatar associated with the user. If your posts have multiple authors you may use the <a href="https://wordpress.org/extend/plugins/co-authors-plus/" title="Co-Authors Plus WordPress plugin" rel="ugc">Co-Authors Plus</a>, the Author Spotlight will then display all the author profiles one below another for such post/page.
Note that installing the User Photo or Co-Author plugin is purely optional, this widget will work fine without them as well.
If you face any issues with the plugin or have any suggestion/feature requests please do so <a href="https://wordpress.org/tags/author-profile" title="Author Spotlight plugin support forum" rel="ugc">at the support forum</a>.

Author Spotlight (Widget)

A Sidebar widget to display the Author(s) profile on any Page or Post along with Social web links.

Call To Action Plugin vs Author Spotlight (Widget)