TCP-over-pure-HTTP implementation

This post is about pure HTTP tunnel, not tunnels using CONNECT and HTTPS. I just want to list them here as I always loose half an hour to find all them again in google:

GNU HTTPTunnel (Probably the oldest and the most used. It support only one connection at a time.)

SOHT (A Java servlet)

HTun

HTTunnel

TCP-over-CGI

HTTP-Tunnel (a PHP application)