OpenGG

Simple and small lightbox clone, Modded from Joel Vardy’s lightbox, more info at http://blog.ilooker.tk/
Download and install, that’s all you need to do. And when you post articles with images, this plugin (the js script actually) will automatically lightbox those unlinked images (would not affect those images with links).
For example, I posted an article, with two image unlinked to anything (let’s call them image1 and image2), one image linked to another webpage (called image3). Then when someone click on these three images, image1 and image2 will be lightboxed but image3 will not.
Demos: 
<a href="https://jquery-littlebox-for-wp.googlecode.com/svn/trunk/demo.htm" title="Demo on Googlecode" rel="nofollow ugc">Demo on Googlecode</a> 
<a href="http://blog.ilooker.tk/" title="My blog" rel="nofollow ugc">My blog</a>
<h3>Issue list</h3>
<ul>
<li>Large image overflowing issue;</li>
<li>Iframes and flash objects unsupported yet;</li>
<li>Image groups unsupported yet (one click one image, no prev/next);</li>
<li>Not so customizable for users yet;</li>
<li>UI design improving needed.</li>
</ul>

jQuery Littlebox for WP

Simple and small lightbox clone, Modded from Joel Vardy's lightbox, more info at http://blog.ilooker.tk/

Bjørn Johansen

Angry Creative

arontornberg

Lazy loading makes your site load faster and saves bandwidth.
This plugin replaces all your post images, post thumbnails, gravatar images and content iframes with a placeholder and loads the content as it gets close to enter the browser window when the visitor scrolls the page. Also works with text widgets.
Since it works with iframes, it also covers embedded videoes from YouTube, Vimeo etc.
You can also lazy load other images and iframes in your theme, by using a simple filter.
Non-javascript visitors gets the original element in noscript.
Compatible with the <a href="https://wordpress.org/plugins/ricg-responsive-images/" rel="ugc">RICG Responsive Images</a> plugin for responsive images.
Please let me know if you have any issues. Fastest way to get a response is by Twitter: https://twitter.com/bjornjohansen
<h4>Translations</h4>
<ul>
<li>Russian (ru_RU) by Elvisrk</li>
<li>Hebrew (he_IL) by Imri Sagive</li>
<li>Polish (pl_PL) by Maciej Gryniuk</li>
<li>Norwegian Bokmål (nb_NO) by Bjørn Johansen</li>
</ul>
<a href="https://github.com/bjornjohansen/bj-lazy-load" rel="nofollow ugc">Development happens at GitHub</a>. Pull requests are very welcome.
<h3>Optional usage</h3>
If you have images output in custom templates or want to lazy load other images in your theme, you may pass the HTML through a filter:
<pre><code><?php
$img_html = '<img src="myimage.jpg" alt="">';
$img_html = apply_filters( 'bj_lazy_load_html', $img_html );
echo $img_html;
?>
</code></pre>
Note for developers: The filter has a priority of 10.

BJ Lazy Load

Lazy loading for images and iframes makes your site load faster and saves bandwidth. Uses no external JS libraries and degrades gracefully for non-js  …

jQuery Littlebox for WP vs BJ Lazy Load