[sp0ck]

You have very narrow definition of what software router/service router is. Firewall and two interfaces and VPN server is not the best scenario :) All those systems (pfSense etc) are for private/soho use. Big networks need stuff that is not avaiable on mentioned platforms like i.e BFD (Bidirectional Forwarding Detecion), MPLS (MultiProtocol Label Switching), VXLAN (Virtual Extensible LAN), IS-IS routing protocol or Segment Routing.

If anyone knows other Opensource routing software that support all of this - let me know. To my knowledge vOS is the only one.

[ihattendorf]

DANOS [0] supports all of those I believe. It's essentially AT&Ts continued development of Vyatta (a subset of it at least) with a DPDK dataplane + multiple other enhancements.

[0]: https://www.danosproject.org/