janrenz

With Usage of the wordpress.com inofficial webpage to screenshot function this plugins generates screenshots of websites. For more information check http://bdisco.de/wordpress-plugins/ 
There are a few options you can use in your shortcode [webscreenshot]:
url: full Url of the webpage which you want to have screenshoted (mandantory)
width: Pixel width of the screenshot (optional, default: 250)
refresh: If you want to reload the screenshot if it wasn’t generated on the first call (optional, default: true)
link: link image to given url (optional, default: true)
newpage: open link in new page (optional, default: true)
title: set link title tag (will be used as img alt tag also) (optional, default:”)
All img-tags generated will have a class called “webscreenshot”, the link will have a class called “webscreenshot-link” which you can you to perform additional style stuff
Feel free to make pull requests at https://github.com/jprberlin/web-screenshots

Web Screenshots

Displays Thumbnails of a given URL usings wordpress.com inofficial API. Use Shortcode [webscreenshot] with url and some  optional params.

Babar

Take a snapshot of a website and embed it on your blog post on the fly. No need any screen capture tools, no need any coding. 
Just insert the shortcode, and snapshot will be embed automatically on your post.
Here is an example: <code>[snap url=http://example.com alt="This snapshot has taken by Snap A Site"]</code>
For more details reffer to the User Manual part of the readme.txt file or find <a href="http://en.ibabar.com/snap-a-site#manual" title="Find the user manual of Snap A Site on my blog" rel="follow nofollow ugc">Snap A Site user manual</a>
Still searcing for something? Just drop a message @ <a href="http://en.ibabar.com" title="Use the contact form on my blog" rel="follow nofollow ugc">My Blog</a>
<h3>User Manual</h3>
It’s easy. Just insert this shortcode in your post: [snap url=http://example.com]
Supported parameters for [snap]
<ul>
<li>url – URL of the site to take snapshot</li>
<li>alt – For image alt</li>
<li>h – For imahe height</li>
<li>w – For image width</li>
<li>alt – For image alt</li>
<li>h – For imahe height</li>
<li>w – For image width</li>
<li>title -For link title</li>
<li>target – For link target</li>
<li>rel – For link rel</li>
<li>link – For linking to other site</li>
</ul>
Have further question? Let me know. Just drop a message @ <a href="http://en.ibabar.com" title="Use the contact form on my blog" rel="follow nofollow ugc">My Blog</a>

Snap A Site

The easiest way to take and embed snapshot of a site on Wordpress blog.

Web Screenshots vs Snap A Site