Kate on all Platforms - 2024
All Unix like systems with either X11 or Wayland are well supported since ever.
Linux with X11 and now Wayland is for a long time the primary system on that Kate work happens.
Over the years it was, like most of the KDE applications, ported to various BSD variants.
Be it some mainstream Linux distribution like Fedora or a niche one like NixOS, Kate is available as binary package. You love BSD? From FreeBSD to OpenBSD, you can get a Kate package via your normal package system.
And in the normal case, you can just build it from source on your own, all needed patches should be in our repositories upstream. If that is not the case for your system, please help to upstream them.