Rebound
An TCP tunneling server requiring only a SSH client.
Usage
We want to access <local_address>:<local_port> from machine A's network as <target_port> on machine B.
Opening the tunnel on machine A
ssh -R 0:<local_address>:<local_port> root@rebound-server -p 80
Connecting to the tunnel on machine B
ssh -L <target_port>:0.0.0.0:1 <secret>@rebound-server -p 80