Penguin

Acronym for Internet Protocol Tunneller.

Predecessor to WanDaemon. It was PeerToPeer before PeerToPeer was "cool". It worked reasonably well for the simple job it tried to do, it had several nasty bugs (for instance it would war, two (or more) IPT's would send traffic to each other at full speed flooding each other). Now retired in favour of WanDaemon.