OpenSSH command descriptions

scp — Secure copy (remote file copy program)
sftp — Secure file transfer program
sftp-server — SFTP server subsystem
ssh — OpenSSH client (remote login program)
ssh-add — Add RSA or DSA identities to the authentication agent
ssh-agent — Authentication agent
ssh-askpass — X11-based passphrase dialog for OpenSSH
ssh-keygen — Authentication key generation, management, and conversion
ssh-keyscan — Gather ssh public keys
ssh-keysign — ssh helper program for host-based authentication
sshd — OpenSSH daemon