SDN: Industry standard opensource networking os for router/firewall/vpn

Hello,

Guys, I want to ask what are todays trends in networking os field. I am looking for some networking os for router/firewall/vpn. Of course I am aware of pfsense, etc, but I am looking for something that is "more enterprise ready" and modern. ( openmetrics, shippable logs, API for automation, etc )

I heard about:

- DANOS ( vyatta fork probably )

- Cumulus ( too bad that netq is enterprise only product )

- vyOS

Any ideas?

Thanks