WireGuard - Fast, Modern, Secure VPN Tunnel
Firezone - Firezone is a remote access platform that’s painless to deploy, easy to manage, and built on WireGuard® to be blazing fast. Best of all it's self-hosted and open-source.
Pritunl - Pritunl is an open-source enterprise distributed OpenVPN and IPsec server.
Viscosity - Viscosity is a VPN client for Mac OS X and Windows.
OpenVPN - OpenVPN - The Open Source VPN
Tunnelblick - free software for OpenVPN on OS X and macOS