No mention of Eleventy [1] here. Definitely worth a look, my personal view is it nails the balance of simplicity, power and flexibility. I have used it for all sorts of projects, from marketing websites to quick client docs and presentations. For non-trivial usage in a project see google web.dev [2].
[1] https://www.11ty.dev
[2] https://github.com/GoogleChrome/web.dev