Arb-Scan is a remote banner scanner written in bash and Perl. It supports 12 different services banner checks (daytime, ftpd, sshd, smtpd, domain, finger, httpd, pop2, pop3, nntp, imapd and snpp). It features IP file reading, logging, random IP scanning, ftp anonymous login checking and VRFY/EXPN smtp checking.
NovaDNS is a program to manage many BIND zonefiles (domains) from a user-friendly, Web-based GUI. The zones are stored in a MySQL database, maintained through the Web GUI, and are periodically generated from the database. User information is also stored in a MySQL database. Users can only maintain their own domains, while administrators can maintain all domains (zone files) on the server. This program is especially useful for large ISPs with many customers.
DDDNS (Delegated Dynamic DNS) ensures that if your dynamic DNS name resolves, then it is because your server is present (i.e. connected to the network). This is done by delegating a DNS sub-zone to your current IP address. If your server is not present, or if another server has taken your former IP address, the name does not resolve. DDDNS uses nsupdate to send RFC2136 updates to the upstream DNS server. DDDNS names are fail-safe for mail delivery and general hosting.