written on Go programming language. It uses Diffie-Hellman Encrypted Key
Exchange (DH-EKE) for mutual zero-knowledge peers authentication and
authenticated encrypted data transport. Other features include:
-IPv4/IPv6, rehandshake, heartbeat, pre-shared keys (PSK), perfect
-forward secrecy (PFS). GNU/Linux and FreeBSD support.
+IPv4/IPv6, rehandshake, heartbeat, pre-shared authentication keys (PSK),
+perfect forward secrecy (PFS), replay attack protection, JSON real-time
+statistics. GNU/Linux and FreeBSD support.
Home page: http://www.cypherpunks.ru/govpn/
also available as Tor hidden service: http://vabu56j2ep2rwv3b.onion/govpn/