I've been watching how Go and Rust tooling has been finding its way into the JavaScript ecosystem. I've been out of the PHP realm for about 10 years but I did find RoadRunner for PHP at one point. That's also an app server written in Go I believe. I wonder how this compares.
My understanding is RoadRunner is more like FrankenPHP's "worker mode" (RoadRunner only makes sense in context of Laravel Octane), where as FrankenPHP can run "normally" as well.