The OpenVPN client ( https://sourceforge.net/projects/openvpn-gui ) is the standard VPN client for OpenVPN protocol on Windows. Unfortunately you have to enter your username+password each time you're connecting. Since the client does not offer a way to save the users login details, you can now use this OpenVPN GUI Login-Tool. Enter your username and password, save it. Then, as long as the app is running, you don't need to enter your login details ever again. Useful!
(don't worry, the login...