Sitelen Mute is my fork of fgallery. It’s a static image gallery generator. I used it for a few years to generate our image galleries.
These days I no longer use it. I just upload the pictures, resize to a width of 1200px and append them to a page using Oddµ.
Alternative by @rostiger@merveilles.town:
Memoir is a bash script to create personal travel logs and photo albums. It turns one or more directories containing images into optionally password protected photo galleries and uploads them to a webserver using rsync. Image size variants are automatically generated using imagemagick. They are stored in subdirectories for faster gallery loading and bandwith conservation. – Memoir