Grant Mangham

Unfeature simply associates a checkbox with the featured image of a specific post, allowing you to control whether or not this image will show on the single template.

Unfeature

Simply associates a checkbox with the featured image, allowing it to be skipped on single posts.

zggz

If your theme makes thumbnail pictures links (which casuses a useless refresh on click), 
use this plugin to disable that. That’s it. Once enabled, it will make every featured image 
(on a post/page) unclickable.
<h3>Contributing</h3>
If you have any requests, bugs, or improvements, leave them at the GitHub for this plugin 
<a href="https://github.com/zggz/unclickable-featured-image" title="GitHub Repository" rel="nofollow ugc">GitHub repo link</a>

Unclickable Featured Image

A WordPress plugin that forces all featured images to NOT be links

Unfeature vs Unclickable Featured Image