- [Nest](http://www.targeted.org/nest/)
- [OpenS/WAN](https://www.openswan.org/projects/openswan/)
- [OpenVPN](http://openvpn.net/)
+- [PeerVPN](http://www.peervpn.net/)
- [Poptop](http://poptop.sourceforge.net/)
- [QuickTun](http://wiki.qontrol.nl/QuickTun)
- [SocialVPN](http://socialvpn.wordpress.com/)