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.

roberto.c

Please use at least version 1.8.3 of NextGEN Gallery. This plugin is not tested with lower versions
[ A T T E N T I O N ] NextGEN Gallery core modification required!
Read <a href="https://wordpress.org/extend/plugins/nextgen-gallery-authors/installation/" rel="ugc">installation page</a>
NextGEN Gallery Authors is an add-on for the best wordpress gallery plugin i have seen! With my plugin, you can show galleries filtered by author.
<h3>Credits</h3>
Copyright 2011 by Roberto Cantarano
This program is free software; you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published by 
the Free Software Foundation; either version 2 of the License, or 
(at your option) any later version.
This program is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
GNU General Public License for more details.

NextGEN Gallery Authors

This plugin will let you show galleries filtered by author.

ZMT fancybox vs NextGEN Gallery Authors