WampServer's functionalities are very complete and easy to use so we won't explain here how to use them.
Simple, Powerful, Secure File Transfers for All
Cyberduck is a libre server and cloud storage browser for Mac and Windows with support for FTP, SFTP, WebDAV, Amazon S3, OpenStack Swift, Backblaze B2, Microsoft Azure & OneDrive, Google Drive and Dropbox.
WinSCP is a popular SFTP client and FTP client for Microsoft Windows!
FireFTP is a free, secure, cross-platform FTP/SFTP client for Mozilla Firefox which provides easy and intuitive access to FTP/SFTP servers.