- [CIPE](http://cipe-linux.sourceforge.net/)
- [cjdns](https://github.com/cjdelisle/cjdns)
- [FairVPN](http://minerva.netgroup.uniroma2.it/fairvpn)
+- [fastd](https://projects.universe-factory.net/projects/fastd/wiki)
- [FreeLAN](http://www.freelan.org/)
- [GVPE](http://software.schmorp.de/pkg/gvpe.html)
- [l2tpd](https://sourceforge.net/projects/l2tpd)
- [P2PVPN](http://www.p2pvpn.org/)
- [QuickTun](http://wiki.qontrol.nl/QuickTun)
- [SocialVPN](https://socialvpn.wordpress.com/)
+- [SoftEther VPN](https://www.softether.org/)
- [strongSwan](https://www.strongswan.org/)
- [VPMN](https://github.com/prodrigestivill/vpmn)
- [VTun](http://vtun.sourceforge.net/)