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Media Defaults allows you to specify default settings for inserting media and galleries into posts, pages and custom post types. The following list shows all the items that can have a custom default 
setting:
<ul>
<li>Inserting Media
<ul>
<li>Attachment Filter – display only items “Uploaded to this post” or any other filter, such as 
“Audio” or “Unattached”</li>
<li>Alignment – the default alignment setting for images</li>
<li>Attachment link – what happens when the user clicks on the media item, e.g., “Embed Media Player”, 
“Link to Attachment Page”, “None”, etc.</li>
<li>Attachment Size – the default size setting for images </li>
</ul>
</li>
<li>Adding Galleries
<ul>
<li>Thumbnail link – the destination when users click on an image in the gallery</li>
<li>Number of columns – how many images to display in each gallery row</li>
<li>Random order – whether Random will be selected by default for new galleries</li>
<li>Thumbnail size – the default size when creating new galleries</li>
</ul>
</li>
</ul>
Media Defaults does this in a way that is unobtrusive and integrates seamlessly with WordPress’ 
native interface. See the screenshots for examples.
Media Defaults uses WordPress’ native defaults when installed so you won’t notice any change until you alter the settings to your liking.
Media Defaults does NOT make changes to existing content, galleries or to WordPress’ [gallery] 
shortcode. It only adds new sections to Settings > Media in the WordPress admin area that allow 
you to specify new defaults for creating galleries or inserting media, and implements those 
defaults in the “Add Media” popup screen.
Requires WordPress 3.6 and PHP 5.

Media Defaults

Set site-wide defaults for creating galleries and inserting media.

Dougal Campbell

FancyBox Gallery integrates the FancyBox jQuery plugin into the WordPress 
gallery functionality. Simply use the gallery shortcode to display 
thumbnails in your posts with the option to link directly to the images (not 
the attachment template), and the plugin handles the rest. You get nice 
popups for the larger sized images, scaled to fit in the browser window, 
with a nice overlay effect.
<h4>Features:</h4>
<ul>
<li>Automatically scales large images to fit in window</li>
<li>Adds a nice drop shadow under the zoomed item</li>
<li>Groups related items and adds navigation through them (uses preloading)</li>
</ul>
FancyBox jQuery features, not yet implemented in the WordPress plugin:
<ul>
<li>Can display images, inline and iframed content</li>
<li>Customizable through settings and CSS</li>
</ul>
<h3>ToDo</h3>
<ul>
<li>Add a settings screen. Allow control of FancyBox display options.</li>
<li>Let user set their own CSS selector, instead of assuming the standard 
WordPress shortcode.</li>
</ul>
<h3>Credits</h3>
The FancyBox jQuery plugin is by Janis Skarnelis, and can be found here:
http://fancy.klade.lv/

FancyBox Gallery

Integrates the FancyBox jQuery plugin to generate dynamic pop-up image overlays for WordPress galleries.

Media Defaults vs FancyBox Gallery