WingFTP

WingFTP Server is an easy-to-use, powerful, and free FTP server software for Windows, Linux, and Mac OS.

It supports multiple file transfer protocols, including FTP, FTPS, HTTP, HTTPS, and SFTP, giving your clients flexibility in how they connect to the server.
And it provides admins with a web-based interface to administrate the server from anywhere.
You can also monitor server performance and online sessions and even receive email notifications about various events taking place on the server.

default credential : qnap / qnap

require an additional commercial license, at the end of the trial period
after the trial, WingFTP will runs in degraded version, but still working
Note that Qnap users have a discount when contacting sales of wingftp

Versions available for download:

• TS-NASX86