@erikk@chaos.social static site generator; they're great bikeshedding, yakshaving NIH programming projects and there's already a billion in existance, but of course mine is special.
https://shayu.it can already do some kinda special cool things wrt React and double rendering, but I'm now generalizing it's architecture even more so I can easily add custom functionality like "this site subfolder is managed by this custom code" and then that custom code can for example generate separate gallery pages for all the pictures in it