... use the same secure remote access software on OS X and Windows.

...get a commercially supported UNIX Secure Shell server.

...have secure terminal
emulation for my Mac OS X systems.

...replace nonsecure Telnet.

...replace nonsecure FTP.

...securely transfer files with simple drag and drop.

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SecureFX^®   

SecureFX is a flexible, secure file transfer application with
a visual interface that is easy to learn. Keep track of all your tasks easily with tabbed sessions, even advanced features like site synchronization.