The OpenSSH suite includes the ssh program which replaces rlogin and telnet, scp which replaces rcp, and sftp which replaces ftp. Also included is sshd which is the server side of the package, and the other basic utilities like ssh-add, ssh-agent, ssh-keysign, ssh-keyscan, ssh-keygen and sftp-server.
OpenSSH supports SSH protocol versions 1.3, 1.5, and 2.0.
MacSSH is a Macintosh open-source Telnet Terminal emulation application with SSH (version 2) protocol support released under the GNU General Public License as published by the Free Software Foundation.