There's Docusaurus and MkDocs. Docusaurus has a React Frontend, and MkDocs is python-based.
IMO MkDocs Material is very easy to set up and customize. Use Docusaurus if you need a lot of customization. Both of these have built-in search and output static websites.
MkDocs Material is sponsorware, though. If you need the "blog" feature you'll need to cough up $15. Docusaurus is from Meta and is fully free.