OpenSSH should already be installed and available by default via ssh.
Use sshfs for files or ssh for shell access.
In PuTTY:
Connection → SSH →
[x] “Enable X11 forwarding”
“x display location: ” localhost:0
Note: Ensure Xming is running before connecting.
ssh -XC name@host
or
ssh -YC name@host
Note: You’ll need XQuartz installed and running when you connect if you’re on a Mac. This is an Apple-developed app.