tube v1.0a is a simple proxy daemon that allows you to use telnet-like commands when tunneling through very restrictive firewalls. Configurable.
You can download it from the following link: https://packetstormsecurity.com/files/download/13370/tube-1.0a.tar.gz
Source: https://packetstormsecurity.com/files/13370/tube-1.0a.tar.gz.html