- [CloudVPN](http://freecode.com/projects/cloudvpn)
- [FairVPN](http://minerva.netgroup.uniroma2.it/fairvpn)
- [CloudVPN](http://freecode.com/projects/cloudvpn)
- [FairVPN](http://minerva.netgroup.uniroma2.it/fairvpn)
- [GVPE](http://software.schmorp.de/pkg/gvpe.html)
- [l2tpd](http://sourceforge.net/projects/l2tpd)
- [Nest](http://www.targeted.org/nest/)
- [OpenS/WAN](https://www.openswan.org/projects/openswan/)
- [OpenVPN](http://openvpn.net/)
- [GVPE](http://software.schmorp.de/pkg/gvpe.html)
- [l2tpd](http://sourceforge.net/projects/l2tpd)
- [Nest](http://www.targeted.org/nest/)
- [OpenS/WAN](https://www.openswan.org/projects/openswan/)
- [OpenVPN](http://openvpn.net/)
- [QuickTun](http://wiki.qontrol.nl/QuickTun)
- [SocialVPN](http://socialvpn.wordpress.com/)
- [strongSwan](http://www.strongswan.org/)
- [QuickTun](http://wiki.qontrol.nl/QuickTun)
- [SocialVPN](http://socialvpn.wordpress.com/)
- [strongSwan](http://www.strongswan.org/)