If you wants something with a nice web interface, probably OpenWrt [1] or OPNsense?

[1] Yes, it seems that they are still on 6.12.112, but they'll probably roll out an update quickly. Also see: https://forum.openwrt.org/t/cve-2026-98432-kernel-update-or-...

If you have a separate WiFi AP running your own router on your *nix of choice is quite achievable. I use NixOS since I use it everywhere else, if I didn't I'd probably go with OpenBSD.