Thumbnails by Thumber..
A dynamic GD thumbnail image gallery generator.. from corz.org note: if your pop-up doesn't automatically resize to fit the image, check your web browser's javascript security settings, possibly you have that disabled.
Quick snaps I took whilst working on ESP32; probably with my phone (Original Bison Pro; so quality won't be my usual). But they are instructive enough to be worth a sort/upload.