⚡ KCP - A Fast and Reliable ARQ Protocol

Official git repo for iodine dns tunnel

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

A high-performance tun2socks for Linux/Android/FreeBSD/macOS/iOS/WSL2 (IPv4/IPv6/TCP/UDP)

Bidirectional data stream tunnelled in HTTP requests.

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

A censorship circumvention tool

Tunnel TCP connections through ICMP.

A Simple Point-to-Point tunnelling implementation in C

Cross-platform terminal tunnel tool

Linux TUN/TAP wrapper for Python

EoIP/EoIPv6 for *nix.

A simple VMess proxy implementation written in C.

Socket over DNS tunnel

BMX7 / SEMTOR Securely Entrusted Mesh Routing Protocol

Create an UDP-over-UDP reverse tunnel to make a VPN server behind (CG-)NAT accessible from the outside

ICMP/IP tunnel manager for Linux.

一个tcp代理工具；借助公网服务器中转，可以把NAT内的远端设备的tcp端口映射至localhost，访问localhost映射端口相当于访问远端设备端口。

sixxsd - The SixXS Daemon - IPv6 Tunnel & Routing Engine

TeaVPN2 - An open source VPN Software (currently supported platform is only Linux).