Thomas Schulte

This plugin dynamically shows preview screenshots of hyperlinks as tooltips on your WordPress site.
For the tooltip effect a jQuery plugin called “qTip2” is used internally. 
Find more about this great project here: http://qtip2.com/ 
The thumbnails are provided by http://thumbsniper.com and its API.

ThumbSniper

This plugin dynamically shows preview screenshots of hyperlinks as tooltips on your WordPress site.

Ranuka

The Website Screenshot to Media Library plugin enables you to add a screenshot of any webpage to your media library by utilizing the ScreenshotOne API. Please note that we are not affiliated with the ScreenshotOne API.

Website Screenshot to Media Library

The Website Screenshot to Media Library plugin enables you to add a screenshot of any webpage to your media library by utilizing the ScreenshotOne API …

ThumbSniper vs Website Screenshot to Media Library