I'm quite fond of Cerberus FTP program (www.cerberusftp.com) and it's free.
Here's the description from their website:

Cerberus FTP ServerTM provides powerful, multithreaded
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), 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. The server adheres to RFC959  and RFC1123.

This product is "free for personal use and not-for-profit charitable
organizations".

I find it works quite well.
Carey

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