SelfGallery
Designed for Apache HTTP servers running PHP 7, SelfGallery is a self-contained, drop-in Gallery index for any folder with pictures.
With a single index.php file placed in any directory, instantly a complete and self-contained gallery is created.
Features
Beyond just indexing images, SelfGallery also intelligently generates thumbnails, figuring out the best quality and resolution for each. In addition, results are cached, so that the server never does the same work twice.
It works great on servers of all scales running Apache.