Light-weight, secure and modular VPN solution which makes use of NaCl encryption (also available for Android using jnacl in "sigmavpn-android")

Tunneling data through SSL

ICMP/IP tunnel manager for Linux.

sixxsd - The SixXS Daemon - IPv6 Tunnel & Routing Engine

Fly through a tunnel!

A tunnel service to proxy any client and server

A simple TUN/TAP to stdio proxy.

A simple VMess proxy implementation written in C.

EoIP/EoIPv6 for *nix.

A censorship circumvention tool

C tunnel helper

A Simple Point-to-Point tunnelling implementation in C

Socket over DNS tunnel

TC programs made for wrapping and unwrapping marked FOU-encapped packets. Being used for Compressor V2

IPv6 everywhere (and usually peer-to-peer)

Minimalistic tap-ucspi utility

A fast, secure and reliable VPN service based on non-standard protocol

Transparent HTTPS proxy written in C using `epoll`

Transparently tunnel your IP traffic through ICMP echo and reply packets.