Not a command, but a little known feature of the Terminal app:
(shift+command+K) or Menu 'Shell' -> 'New Remote Connection...'
opens a SSH, S(FTP), TELNET connection manager window!
(shift+command+K) or Menu 'Shell' -> 'New Remote Connection...'
opens a SSH, S(FTP), TELNET connection manager window!
It's quite a good VNC client, too.