This very website.
Technologies
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Static website generators are a great match for simple website like this one, however things become complicated rather quickly when you introduce relationship between your pages and models. Indeed, flat files can't quite express what databases foreign keys can.
Wagtail on the other hand, is great at managing complex structures and is definitely more future proof but it can be a bit overkill, especially in term of hosting.
This website meets those two radically different approaches half-way, with the content being managed by Wagtail and rendered to HTML files which are then served directly.