http://www.openvpn.net/index.php/access-server/download-openvpn-as.html
OpenVPN Access Server (OpenVPN-AS) is a set of installation and configuration tools that simplify the rapid deployment of a VPN remote access solution. It is based on the popular OpenVPN open-source software, making the deployed VPN immediately compatible with OpenVPN client software across multiple user platforms.
OpenVPN-AS features include:
■A simple, Web-based Admin UI for configuration and management.
■An easy-to-use, GUI-based OpenVPN Client software package for Windows.
■A Client Web Server that automatically generates a client configuration and a pre-configured Windows VPN Client software installer for the user upon successful login.
■Integration with existing authentication systems using RADIUS, LDAP, and PAM
OpenVPN-AS gives you the broad support and robust security of the OpenVPN open-source software project, coupled with the configuration and management tools needed to deploy the VPN solution easily and quickly.