Greg - SiteOrigin

The SiteOrigin Masonry plugin gives you a widget that you can use to display your posts. It gives you a widget you can add to your <a href="https://wordpress.org/plugins/siteorigin-panels/" rel="ugc">Page Builder</a> pages or sidebar.
Take a look at the demo <a href="http://demo.siteorigin.com/origami/masonry-layout/" rel="nofollow ugc">here</a>.
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Masonry Widget

The SiteOrigin Masonry plugin gives you a widget that you can use to display your posts. It gives you a widget you can add to your Page Builder pages  …

Eduardo Zulian

The Post Format Gallery Widget plugin creates the possibility for you to display images from your galleries inside posts saved under the format ‘Gallery’. You can select the number of images to display, the size of these images, shuffle their orders, the target of links (image file, permalink to attachment, permalink to post or maybe no linking), show captions and use one copy of the basic WordPress style for galleries, which will allow you to set up easily a number of columns.
Important: your theme must support the <a href="https://codex.wordpress.org/Post_Formats#Adding_Theme_Support" rel="nofollow ugc">Gallery post format</a>, otherwise it won’t work.

Post Format Gallery Widget

Display in a widget images from your galleries saved under the post format Gallery.

Masonry Widget vs Post Format Gallery Widget