This is an interesting piece of software as the host runs under FreeBSD and we run that on our office server...
This kind of thing (a tunnel over HTTPS, port 443) is becoming common in the corporate world for travelling execs who need full internet access, and VPN access, when on the move but hotel networks often block the required ports.
There are a lot of hardware solutions (boxes) which do VPN over port 443 but software is normally cheaper to buy
Hardware boxes are preferred for serious stuff because HTTPS is very processor intensive on the server.