4. Openvpn GuiOpenVPN GUI is a graphical frontend for OpenVPN running on Windows 7 / 8 / 10. It creates an icon in the notification area from which you can control OpenVPN to start/stop your VPN tunnels, view the log and do other useful things.
5. Openvpn3OpenVPN 3 is a C++ class library that implements the functionality of an OpenVPN client, and is protocol-compatible with the OpenVPN 2.x branch.