This is the software publisher’s description.

Cerberus FTP Server provides industrial strength secure SSL/TLS encryption and powerful FTP server performance without sacrificing ease-of-use. Designed to use very little CPU and memory, Cerberus features a user-friendly interface that can be easily hidden or accessed from the system tray.

The server is able to listen for connections on multiple interfaces (Multi-homed PCs), integrate with the Windows NT user database or Active Directory, run as an NT service, resume failed transfers, and offers an easy-to-use manager for controlling user access to files and file operations. Connection limit, timeout, and IP access can be controlled by the administrator as well as a variety of other settings. In addition, Cerberus FTP Server offers statistics on connections as well as robust logging capabilities.

Note that this product is "free for personal use and not-for-profit charitable organizations". If you are a company, and do not fall under the " personal use" or "not-for-profit charitable organization" license, you may purchase Cerberus FTP Server.