There's a users page (https://soupault.app/users/), most come with source code links.

ocamlbook.org may be the most illustrative one: it exploits soupault's ability to pipe HTML element content through an external program to automatically type-check code examples in <code> tags with the compiler and also syntax-highlight them with an external tool. The approach would translate to any language without a need for language-specific tools.

Looks like its own website is built with Soupault: https://github.com/dmbaturin/soupault-website

The main repository also has directories called 'sample-site' and 'examples': https://github.com/dmbaturin/soupault

I have been slowly rewriting my static blog from Hakyll to Nix + Soupault to simplify the tools used, remove Stack, and make the outputs reproducible. The maintainer is quick to respond to any questions and suggestions as well.