[asteadman]

I haven't run across anything convincingly good. I've put together my own system (that is nowhere near as advanced as what you are suggesting) using a static site generator (jekyll) and a script to sync my image folders to s3 and generate yaml files for the albums. I use lambda/apigateway for the login endpoint and that generates a cloudfront signed cookie for access control to the otherwise static website. It works but I wish I had more time to add features (search, tagging, face detection, etc...). Not really something that i plan on open sourcing though.