Cisco SD-WAN - SD-WAN is a software-defined approach to managing the wide-area network, or WAN.
WireGuard - Fast, Modern, Secure VPN Tunnel
Cisco Meraki SD-WAN - What is SD-WAN?
OpenVPN - OpenVPN - The Open Source VPN
VeloCloud - SD-WAN
Tunnelblick - free software for OpenVPN on OS X and macOS