FreeBSDs Wayland support is pretty good, it supports Plasma perfectly and most wlroots based compositors. OpenBSD is more experimental, I know Sway (and presuma

FreeBSDs Wayland support is pretty good, it supports Plasma perfectly and most wlroots based compositors. OpenBSD is more experimental, I know Sway (and presumably other simple wlroots based compositors) work alright but I wouldn't hold my breath for KDE support. I haven't heard anything from NetBSD or DragonflyBSD