I've been wanting to put image collections here and other websites I've built, but it's such a pain, and since moving to 11ty I've lost the ability to just use a plugin like with WordPress. So: I made a thing!
Neat Gallery! is a simple-as-possible tool that you can point at a folder of images and it'll generate a minimal HTML page and set of lower-rez thumbnails. Then you can either upload the folder as-is or copy the relevant bits out and stick 'em on your website somewhere. The cool thing is that it automatically sets up Photoswipe so you can have that best-in-class lightbox user experience.
Here's a gallery I created using just the default settings:
And here's a gallery using the masonry-style layout option.