Swiss File Knife (SFK) is a free command line tool for Windows, Mac OS X and Linux that provides a wide range of file management and file transfer functions. It allows users to quickly and easily copy, move, delete, search, compress, and synchronize files and directories. It also provides a secure connection for file transfers over the Internet, using SFTP, HTTPS, and FTPS (file transfer protocol over SSL). SFK is designed to be lightweight, efficient, and easy to use, while still providing a range of powerful features. It is ideal for IT professionals, system administrators, developers, and anyone who needs to quickly and securely manage and transfer files.
FileZilla Server
CerberusFTP
The discontinued website no longer resolves, although the software can still be downloaded through https://sourceforge.net/projects/wfde/.