Nashita

Simple and clean styling widget for displaying latest posts with thumbnail.
After installed the plugin, WP Latest Posts Widget will be in <code>Available Widgets</code> section named <code>Latest Posts</code>.
Optional settings for <code>Title</code> and <code>Number of Posts</code>.

WP Latest Posts Widget

Widget for displaying latest posts with thumbnail

tsaiid

Featured Image via URL is a plugin to generate the featured image of post from the image url specified. 
The image will be fetched back and saved into the Media Library with all supported sizes. 
If the featured image is already present, the plugin will do nothing.
This plugin is modified from Auto Post Thumbnail by adityamooley.
For more details, see http://tsai.it/project/wordpress-plugins/featured-image-via-url/

Featured Image via URL

Automatically generate the Featured Image from the specified image url in post.

WP Latest Posts Widget vs Featured Image via URL