KVpnc is a KDE frontend for various VPN clients. It supports Cisco VPN (vpnc, vpnclient (a proprietary client from Cisco)), IPSec (FreeS/WAN, Openswan, strongSwan, racoon), PPTP (pptpclient), OpenVPN, L2TP over IPSec (l2tpd, xl2ltpd, openl2tp) (usable with FreeS/WAN, Openswan, strongSwan, and racoon), Vtun, and OpenSSH. Smartcards will be supported within OpenVPN and strongSwan. vpnc is a replacement for the Cisco VPN client, and is used as a client for the Cisco3000 VPN Concentrator. FreeS/WAN, Openswan, and strongSwan are IPSec clients for Linux 2.4.x/2.6.x, and racoon is an IPSec client for Linux 2.6.x and *BSD. l2tpd, xl2tpd, and openl2tp are Linux L2TP VPN clients/servers.
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.
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.
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.