Alex Mills

DISCONTINUATION NOTICE: Development on this plugin has ceased in favor of the carousel module in the <a href="https://wordpress.org/extend/plugins/jetpack/" rel="ugc">Jetpack plugin</a>. I recommend you use that plugin instead — it’s much more full featured.
Makes the native WordPress galleries use a lightbox script called <a href="http://colorpowered.com/colorbox/" rel="nofollow ugc">ColorBox</a> to display the fullsize images right there in the page. No modifications required.
You can also make single non-<code>[gallery]</code> images use the lightbox by giving their links a class of “lightbox”, like so:
<pre><code><a href="..." class="lightbox"><img src="..." alt="..." /></a>
</code></pre>

jQuery Lightbox For Native Galleries

Makes the native WordPress galleries use a lightbox script called ColorBox to display the fullsize images.

w3dev

Seamlessly integrates the fancyBox 3 script into your WordPress installation: Upload, activate, and you’re done. Additional configuration is optional.
You can easily customize almost anything you can think about fancyBox lightbox. By default, the plugin will use jQuery to apply fancyBox to ANY thumbnails that link directly to an image. It will also automatically convert WordPress image galleries into fancyBox galleries.
For Inline content linking 
– Create a link to any hidden or visible div with an ID attribate, and the plugin will transform the link and enable it for fancyBox usage. 
– Note: this may cause a conflict if your page or website is using a smooth scrolling function to jump between page sections!
In upcoming versions, additional functionality for ajax calls and iframe data will be implemented.

fancyBox 3 for WordPress

Seamlessly integrates the fancyBox 3 script into your WordPress installation: Upload, activate, and you're done. Additional configuration is opti …

jQuery Lightbox For Native Galleries vs fancyBox 3 for WordPress