Wikipedia
SmartFTP is a network file transfer program for Microsoft Windows that supports file transfer via FTP, FTPS, SFTP, WebDAV, Amazon S3, Google Drive and Microsoft OneDrive protocols. It supports SSL/TLS, IPv6 and FXP, and features a transfer queue, proxy and firewall support, multiple connections, chmod features and Drag-and-drop. The software uses the Windows API for its interface. It is available for both IA-32 and x64 editions of Windows.
Prior to July 2008, the program was free to home or non-profit users. On July 7, 2008 a post on the SmartFTP forums announced that the software was no longer free to use. SmartFTP is available in two editions: Professional and Ultimate. The Ultimate edition includes all features of the Professional Edition plus Amazon S3, Google Drive, OneDrive support and a Terminal client.