Depends on which ftp server you are using. Webmin has modules that provides a web-based configuration screen for proftpd, pure-FTPd, vsftpd, and the standard ftpd. There really isn't much to configure in setting up an ftp server, so stick with the terminal if you can.
Specific GUIs:
Proftpd -
gproftpd
Pureftpd -
KcmPureftpd