life.object

Chip Get Image is a plugin that grabs images by using its unique Short Circuit Speedy Logic. It is very flexible and easy to use plugin for adding thumbnails, featured images or other images to the blog posts.
Short Circuit Speedy Logic is highly flexible that gives you power to grab an image by your choice from custom field input, WordPress post image feature, post attachment or from all as default behaviour.
Visit <a href="http://www.tutorialchip.com/chip-get-image/" title="Chip Get Image" rel="nofollow ugc">Chip Get Image</a> for usage and more information.

Chip Get Image

A flexible image script for adding thumbnails and feature images to the post.

sewpafly

To meet the needs of themes where the post-thumbnails have random and capricious sizes (which causes wordpress to crop images simply from the middle (either chopping off the top and bottom or chopping off the sides), this plugin attempts to give the users an interface to manually fix those thumbnail and random images.

Post Thumbnail Editor

Does not work

Fed up with the lack of automated tools to properly crop and scale post thumbnails? Maybe this plugin can help.

Chip Get Image vs Post Thumbnail Editor