I wrote a framework for my own use that uses Kotlin + HTMX - https://github.com/reubenfirmin/zoned. The goal was to see if I could create webapps that were fully typed, end to end. It uses Kotlinx.html, which provides a jsx-ish dsl for writing html.

I did the first 90% by hand, and have done the last 10% (and README) with Claude, just to get it out there.