TWDRichard

WP Photo Montage creates a composite montage of a range of images into an (hopefully) attractive montage. 
A shortcode is used to display a montage anywhere in your WordPress posts or pages. 
get-the-image plugin is used so that must be installed too. 
A tmp folder is created to hold temporary images. The folder must be readable and writeable by WordPress.

WP Photo Montage

Poquelin

PhotoGlue is the simplest and fastest way to create photo montages in WordPress. Pick a layout, drop your images into the zones, and save the result as a regular media attachment in just a few clicks — no learning curve, no external tool needed.
Available layouts
<ul>
<li>2 or 3 images side by side, with a customizable divider (straight, zigzag, curve)</li>
<li>Portrait to 16/9 (blurred or colored background)</li>
<li>2 images with a central circle</li>
<li>Image with a floating circle (positionable)</li>
<li>Podium (1st / 2nd / 3rd places)</li>
<li>4-image grid</li>
<li>Panorama + 2 thumbnails</li>
</ul>
Per-zone controls
Move, zoom, rotate (90° / 180°), flip horizontal / vertical, reset.
Output
<ul>
<li>1920×1080 PNG saved as a standard media attachment</li>
<li>Auto-selected in the media picker that opened the editor</li>
</ul>
Translations
Source strings are in English. French (<code>fr_FR</code>) is bundled.

PhotoGlue – Easy Photo Collage Maker

The simplest, fastest way to create photo montages directly from your WordPress media library.

WP Photo Montage vs PhotoGlue – Easy Photo Collage Maker