FTPList/FTPCrawler is a Multi-threaded and MySQL based FTP Crawler, it has a PHP interface which you can use to search in the database, see FTP status (up, full, down), and more.
It's designed for enviorements like big LAN-Partys i.e Remedy.
ftp_lookup is an indexer for ftp-servers on a LAN- / demo-scene-party.
It does index the servers submitted by the user. It does not scan the
network on it's own.