Although Mocha Lite is free and 3.50ukp for the full, I think I much prefer Teleport (even though it costs 15ukp) it's a much better implementation and the auto discovery blows Mocha into the weeds...

If you're gonna use vnc a lot Teleport is a better bet, but if it's an ocassional thing then go with the free Mocha

ymmv.

PS I note there is a telnet client, but it doesn't support ssh, so that's pointless :)

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bombholio