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.

puravida1976

nikitanovikov

devdokimov

STW Support

Dan Harrison

This plugin allows any WordPress user to easily add thumbnail previews of websites right in the content of their posts using a simple <code>[stwthumb]http://www.yourwebsite.com[/stwthumb]</code> format. Loads of examples are available within the plugin documentation (you’ll see it when you activate the plugin).
The plugin requires a free or paid account from the thumbnail provider service <a href="https://shrinktheweb.com/" rel="nofollow ugc">ShrinkTheWeb.com</a>. No purchase is required to use the plugin or the free service.
Cool Features
<ul>
<li>Easily embed web page screenshots anywhere using shortcode!</li>
<li>So simple to use with TinyMCE shortcode helper!</li>
<li>Supports caching screenshots locally</li>
<li>Plenty of examples in the plugin documentation</li>
<li>Custom screenshot image quality</li>
<li>Enable mouseover (hover) screenshot previews</li>
<li>Alt and Title attributes support via shortcodes</li>
<li>Custom filename option support via shortcode for SEO purposes</li>
</ul>
Supported ShrinkTheWeb PRO features
<ul>
<li>Display “Inside Pages” or full URLs (Upgrade required) 
…rather than just the homepage of a domain.</li>
<li>Full-Length screenshot captures (Upgrade required)</li>
<li>Custom Size screenshot captures (Upgrade required)</li>
<li>Custom Browser Resolution (Upgrade required)</li>
</ul>
Take a look at ShrinkTheWeb for more information <a href="https://shrinktheweb.com/" title="Automated Website Preview Provider" rel="nofollow ugc">Shrink The Web</a>.
<h4>Donate</h4>
Did this plugin get you out of trouble? Please consider <a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=ZBNAT7HJACUAG&lc=US&item_name=ShrinkTheWeb&no_note=0&cn=Add%20special%20instructions%20to%20the%20seller%3a&no_shipping=1&currency_code=USD&bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted" rel="nofollow ugc">making a small donation</a> to thank the developer for their time.

ShrinkTheWeb (STW) Website Previews Plugin

This plugin accesses the ShrinkTheWeb API to automatically replace special tags in posts with website screenshots, where desired.

ThumbSniper vs ShrinkTheWeb (STW) Website Previews Plugin