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.

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.

PhotoGlue – Easy Photo Collage Maker vs WP Photo Montage