Jess

<p>Thumbnail Updater does exactly what it’s name implies: it updates thumbnails. WordPress 2.9 introduced support for<br />
post thumbnails but one problem is that the support is not backwards compatible—meaning that if you downloaded or created<br />
a theme that supports post thumbnails, any images uploaded prior to the activation of that theme will not have the new thumbnail size.</p>


Thumbnail Updater

A plugin for updating your thumbnails whenever a new thumbnail size is added with add_image_size()

ankittiwaari

<p>This plugin aims at providing users the capability to upload multiple thumbnails/featured images to a post. It uses wp.media js object to open a image uploader frame and choose/upload images. Once the images are selected, it will save the id of uploaded media object in a custom field.</p>
<h3>Getting uploaded images</h3>
<p>You can use the function aoc_get_images($post_id) to retrieve an array of urls of all the images that have been uploaded to a post. This function accepts the id of post (for which the images are to be fetched) as a parameter.</p>


AOC Multiple Post Images

AOC Multiple Post Images allows a user to upload multiple featured images to a post.

Thumbnail Updater vs AOC Multiple Post Images