One more for mikrotik (I run the VM version on a small linux box).
I tested a ton of those (pf/opn-senses, VyOS, even Cisco), and noone of the free ones can handle IPv6 in a reasonable way in 2024, which is slightly bizzare. Mikrotik has some annoyances, but it's rock solid as a router.
I don’t use its container features and instead run podman in a vm next to it. Works great.