It’s very simply WordPress plugin for „nice“ shows pictures / galleries in lightbox. This plugin implements javascript library fancybox to header and footer pages created in WordPress, functions:
<ul>
<li>you can configure like original fancybox (in admin menu),</li>
<li>you can use multiple galleries on page,</li>
<li>it’s designed for NextGen Gallery.</li>
</ul>

ZMT fancybox

Plugin adds fancybox code to WP header and footer. This plugin is designed for NextGen Gallery. You can use multiple galleries on page.

Brian Zoetewey

Apollo139

jayque9

barclay_reg

This is an add-on for the <a href="https://wordpress.org/extend/plugins/advanced-custom-fields/" rel="ugc">Advanced Custom Fields</a> WordPress plugin and will not provide any functionality to WordPress unless advanced Custom Fields is installed and activated.
The NextGEN Gallery field provides a dropdown (select or multi-select) of NextGEN Gallery names (galleries and albums) and the ability to map the selected NextGEN Gallery to the post. 
The get_value() API returns an array of the selected NextGEN Gallery IDs and the form – album or gallery.
Support ACF5 Pro, ACF4, ACF3, NextCellent Gallery – NextGEN Legacy.
!!! Version 1.1 !!! 
This version changes get_value() API returned value. You must change your template files. !!!
The get_value() API returns a following array: 
 Array ( 
 [0] => Array ( 
 [ngg_id] => 8 ( NextGEN Gallery ‘gallery’ or ‘album’ ID ) 
 [ngg_form] => gallery ( ‘gallery’ or ‘album’ ) 
 ) 
 )
<h4>Example</h4>
These examples should show a NextGEN Gallery gallery or NextGEN Gallery album.
For version 1.1 and later
 
For version 1.0.2 and earlier

Advanced Custom Fields: NextGEN Gallery Field add-on

Adds a NextGEN Gallery Field to Advanced Custom Fields. Select one or more NextGEN Galleries and assign them to the post.

ZMT fancybox vs Advanced Custom Fields: NextGEN Gallery Field add-on