Provides DHCP, bootp, tftp, true dynamic IP addresses, fairly nice reporting tool. Highly recommended by one of our readers. FileRunner is an X11 file manager with built-in FTP support. Tarballs and RPMS available. Good documentation, mailing lists.
Free client is scriptable and can resume stopped downloads.
ProFTPD is a free FTP daemon for Unix and Unix-like systems. Easily configurable, fast, secure, lightweight. Beware the security holes with this package. Make sure you run the latest version. XDIR from LLNL, is a graphical FTP client for Unix.