SFTP Secure File Transfer Protocol or SFTP is a network protocol that provides file transfer and manipulation functionality over any reliable data stream. SFTP typically uses port 22.

SmartFTP SmartFTP is an FTP (File Transfer Protocol) client which allows you to transfer files between your local computer and a server on the Internet. You can read more at smartftp.com.

SMTP SMTP is a relatively simple, text-based protocol, in which one or more recipients of a message are specified (and in most cases verified to exist) along with the message text and possibly other encoded objects. The message is then transferred to a remote server using a procedure of queries and responses between the client and server. Either an end-user's email client, a.k.a. MUA (Mail User Agent), or a relaying server's MTA (Mail Transport Agents) can act as an SMTP client.

ssh Secure Shell or ssh is a network protocol that allows data to be exchanged over a secure channel between two computers.