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.

wpo-HR

NGG Smart Image Search will provide a highly customizable search and display functionality for images in NextGEN Galleries. Search results can be displayed in various layouts including all original NextGEN galleries.
You find more infos and examples on the <a href="https://r-fotos.de/wordpress-plugins/nextgen-galleries-smart-image-search/" rel="nofollow ugc">plugin website</a>.
An image search will be carried out across title, description, filename and tags (as configured per widget or shortcode) of all images in arbitary selectable NextGEN search galleries. There are two search modes available. The basic search mode will look for images which satisfy at least one of the search terms (logical or). The extended search mode will look for images which satisfy all search terms (logical and).
The search result list can be displayed in various ways.
<ul>
<li>you can use any of the native NextGEN Galleries to display the search result list. </li>
<li>you can also use any of the NextGEN Pro / Plus Galleries with all their features including ecommerce.</li>
<li>you can use any available NextGEN Gallery settings.</li>
<li>you can use single image lists and linked image lists providing additional image meta data.</li>
<li>you can use an advanced thumbnail list which is independant of NextGEN Gallery code.</li>
<li>you can use fancybox v5 for image display and show exifdata and/or use NextGEN backup files</li>
<li>you can sort the search result list in various ways.</li>
<li>you can use paging for long search result lists.</li>
</ul>
You can enter search strings via widgets or shortcodes. You can use complex predefined searches to display an almost arbitrary collection of NextGEN Gallery images. You can dynamically switch the search mode or the display mode between searches. Searches can be configured differently for public users or for logged in (private) users.
For an extended documentation see <a href="https://r-fotos.de/wordpress-plugins/nextgen-galleries-smart-image-search/qualified-search-examples/" rel="nofollow ugc">qualified search examples</a> or <a href="https://r-fotos.de/wordpress-plugins/nextgen-galleries-smart-image-search/display-search-result-list/" rel="nofollow ugc">display search result list</a>.
The new <a href="https://r-fotos.de/wordpress-plugins/nextgen-galleries-smart-image-search/new-functionalities/" rel="nofollow ugc">version 3</a> of this plugin is a major update of version 2 with many new functionalities and some optimization and error corrections.

NGG Smart Image Search

NGG Smart Image Search provides a smart search and display functionality for images in selectable arbitary collections of NextGEN galleries.

ZMT fancybox vs NGG Smart Image Search