FileZilla is a free software, cross-platform FTP application, consisting of FileZilla Client and FileZilla Server. Client binaries are available for Windows, Linux, and macOS, server binaries are available for Windows only.
WinSCP is a free and open-source SFTP client, FTP client, WebDAV client, Amazon S3 client, and SCP client for Microsoft Windows. Its main function is file transfer between a local and a remote computer. Beyond this, WinSCP offers scripting and basic file manager functionality.