SSH-Based Solutions - Looking for Industry Proof?

mcwop asks: "My company's IT department is trying to set up secure FTP with a vendor. It would be set up on a Sun box (not running Solaris 9). I emailed suggesting they look at OpenSSH. The response I received stated that they don't like to use freeware, but only consider industry proven and supported software. I have found one commercial version at SSH. What other commercial versions are out there (I know Solaris 9 comes with SSH)? But more importantly, what are some commercial successes? What large organizations are implementing SSH?"