Ironically, a software whose main selling point is security has the word "Open" in it. Anyway, OpenSSH is a open source version of the popular SSH connectivity tool. Unlike other connectivity tools, SSH provides a secure environment for file transfers. The OpenSSH suite replaces rlogin and telnet with the ssh program, rcp with scp, and ftp with sftp. Also included is sshd (the server side of the package), and the other utilities like ssh-add, ssh-agent, ssh-keysign, ssh-keyscan, ssh-keygen and sftp-server - all secure versions. So you don't need to worry about hackers stealing your password and ruining your day. OpenSSH is primarily developed for OpenBSD but is currently ported to other operating systems.