KVpnc is a KDE Desktop Environment frontend for various vpn clients. It supports Cisco VPN (vpnc), IPSec (FreeS/WAN (OpenS/WAN), racoon), PPTP (pptpclient) and OpenVPN.

You need vpnc gt;= 0.3 and Crypto++ (http://www.eskimo.com/~weidai/cryptlib.html)