OpenVPN Web Certificate Manager is a configuration, certification, and management tool for OpenVPN using a Web-based interface. It shows the status of multiple OpenVPN servers running on the same system; for each, it shows the VPN connections and OpenVPN/OpenSSL configuration. Moreover, it provides client certificate management.
eurephia is an authentication plug-in for OpenVPN. It enhances the OpenVPN authentication process by using user name and password authentication in addition to SSL certificates. If too many failed attempts are registered, the user account and/or IP address will be blocked. For Linux servers, iptables support is also included, which can be used to restrict each user's network access through the VPN channel. OpenVPN 2.2 or later is required.
StoneVPN is a system that makes it easy to create certificates and configuration files for use with an OpenVPN server for both Windows and Linux users. It has the ability to create a zip file and e-mail the entire package to a user. It uses pyOpenSSL and custom patches that allow it to manage a CRL file.