-- [SocialVPN](http://socialvpn.wordpress.com/)
-- [strongSwan](http://www.strongswan.org/)
-- [VPMN](http://code.google.com/p/vpmn/)
-- [vpnd](http://vpnd.linuxsys.com/)
+- [SocialVPN](https://socialvpn.wordpress.com/)
+- [strongSwan](https://www.strongswan.org/)
+- [VPMN](https://github.com/prodrigestivill/vpmn)