1. anycasting
  2. dhcpd
  3. acme-client
  4. IPv6
  5. pf
  6. tcpdump
  7. VPN (using IKEv2)
  8. relayd
  9. router
  10. pppoe
  11. npppd
  12. nsd
  13. DDoS Filtering
  14. Unbound
  15. Gopher