WireGuard - Fast, Modern, Secure VPN Tunnel
NordVPN - NordVPN offers VPN technology that encrypts data twice.
Pritunl - Pritunl is an open-source enterprise distributed OpenVPN and IPsec server.
OpenVPN - OpenVPN - The Open Source VPN
SparkLabs - SparkLabs's Viscosity is the OpenVPN client that lets you secure the network.
Tunnelblick - free software for OpenVPN on OS X and macOS