Syncplify.me FTP! is a totally free, graphical, multi-threaded FTP, FTPS, and SFTP client for Windows, featuring:
Protocol support: FTP, FTPS, and SFTP
Multi-tab interface: keep multiple file transfer tabs open at the same time
Supports large files (greater than 2 GB)
Sleek and easy to use GUI
Automatic connection optimization for maximum speed