WinSCP is an open source SFTP client, FTP client, WebDAV client, S3 client and SCP client and file manager for Windows.
WinSCP main function is file transfer between a local and a remote computer. Beyond this, WinSCP offers scripting and basic file manager functionality.
FileZilla is a popular cross-platform FTP, SFTP, and FTPS client with a vast list of features. FileZilla's dynamic tools help you move files between your local machine and your Web site's server effortlessly.