WFTPD is a stable, easy to configure FTP server.

It supports almost all FTP commands, allows multiple logins and simultaneous file transfers, has user-configurable time-out on hung/idle connections and the ability to resume interrupted transfers. Security can be set using password authentication, address-based host authentication, and the ability to restrict users to named subtrees of your directory structure as well as user rights which may be set easily on any directories in your system. There are full logging capabilities and the status bar displays the number of users, and number of sockets in use.