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KnockIt! is a free software project which brings a GUI for Port Knocking. The easy to use interface allows to check the server availability on the chosen port and quickly run the port knocking.
No ICMP yet. Full Cocoa now!
Cheers.
Update V1.1
UDP added
Update V1.2
"Unlimited" ports to knock through a manageable list.
Still free, no reason to pay for something that simple :)