vpnc

Client for cisco3000 VPN Concentrator

http://www.unix-ag.uni-kl.de/~massar/vpnc/

OpenVPN

Full-featured SSL based VPN server

http://www.openvpn.net/

OpenVPN Howto (server) written by Fulvio Ricciardi

OpenVPN Howto (client) written by Fulvio Ricciardi

strongSwan

IPSec client for Linux 2.4.x (Linux 2.6.x)

http://www.strongswan.org/

Openswan

IPSec client for Linux 2.4.x (Linux 2.6.x)

http://www.openswan.org/

ipsec-tools

IPSec client for Linux 2.6.x and *BSD

http://ipsec-tools.sourceforge.net/

pptpclient

PPTP client for Linux

http://sourceforge.net/projects/pptpclient/

l2tpd

L2TP client/server for Linux

http://l2tpd.sourceforge.net

xl2tpd

L2TP client/server for Linux

http://www.xelerance.com/software/xl2tpd/

openl2tp

L2TP client/server for Linux

http://www.openl2tp.org/

vTUN

VPN server for linux

http://vtun.sourceforge.net/

openSSH

secure shell (and more)

http://openssh.net/

Openct

Linux support for smartcard readers

http://www.opensc-project.org/

KDE

Desktop environment

http://www.kde.org/

KDevelop

Development IDE

http://www.kdevelop.org/