So, in haste, I went looking for other free clients. The clients had to have close to the same functionality as SmartFTP, GUI optional. Here is the list of the clients I found.
FileZilla - Open Source FTP Client. Available on Windows and Linux.
WinSCP - Open Source SFTP client and FTP client
NCFTP - Command Line FTP Client
FireFTP - Firefox Integrated FTP Client
And, The winner was... FileZilla.
The feel of FileZilla is close to SmartFTP. This is an excellent client with support for FFP / FTPS (SSL) / SFTP (SSH). It has a Site Manager, Transfer Queues, Drag and Drop support, and Remote File Editing.
So, it's time to welcome in FileZilla, and say "Sayonara" to SmartFTP.