fzsftp is part of FileZilla. It is used to handle SFTP (SSH File Transfer Protocol) connections. It usually gets called by FileZilla and is not intended to be used directly.
fzsftp is based on the psftp component of PuTTY.
Please visit https://filezilla-project.org/ for further information. Report bugs only if you are using the latest version available from the FileZilla website.
Copyright (C) 2004-2018 Tim Kosse
Copyright (C) 1997-2018 Simon Tatham and the PuTTY team
FileZilla is distributed under the terms of the GNU General Public License version 2 or later.