MLMConseil - OPNsense is an open source, easy-to-use and easy-to-build FreeBSD based firewall and routing platform. OPNsense includes most of the features available in expensive commercial firewalls, and more in many cases.
WireGuard mesh network using OPNsense · Tailscale
OPNsense +openvpn client routing in 2020 : r/OPNsenseFirewall
How to Configure VLANs in OPNsense
Dynamic Routing: Configuration: OSPFv2 — OPNsense Wiki & Documentation documentation
Static routing through VPN servers in OpnSense – JRS Systems: the blog