This is "MyIP", an IP-stack with built-in NTP, HTTP, SIP, MQTT, SNMP and VNC server - and more!.
"MyIP" was written in C++ and runs in userspace on at least Linux but maybe also on BSD.
Written by Folkert van Heusden <firstname.lastname@example.org>.
The source code can be obtained from GitHub.
My website: www.vanheusden.com.