Ssh

SSH, which under FreeBSD is generally the version found under the openssh-portable port, is the command-line tool used to access a shell prompt on a remote network computer. (Doing this is commonly referred to as "shelling in" to the remote server.)

SSH distributions also typically include such as the command scp for copying files from remote computers, and/or piping arbitrary data streams through SSH tunnels.

The most common non-Cygwin Windows equivalent to OpenSSH is the freeware (open source?) application PuTTY, although many commercial equivalents are also available.