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AnyEvent::CacheDNS provides a very simple DNS resolver that caches its results and can improve the connection times to remote hosts.

Net::DNS::Match is a Perl extension for testing domains against another list of domains (similar to Net::Patricia but for FQDNs).

This is Net::Bonjour, a set of perl modules to utilize DNS for service discovery. This method of service discovery is branded as Bonjour by Apple Computer.

tinystats is a statistic generator for DJB's tinydns. It can be easily integrated with rrdtool to generate nice graphical DNS stats.

Sleuth is a tool designed to check DNS zones for common errors and also for processing of secondary name service requests.

vhostcname synchronizes DNS with server names and aliases from Apache virtual host configuration. It is part of dnstools, a set of utilities for DNS management and related tasks.

whoseip returns information about IP addresses: country code and network they belong to. It is part of dnstools, a set of utilities for DNS management and related tasks.

sheerdns is a master DNS server whose zone records are stored on a one-record-per-file bases. Because of this, sheerdns is likely the simplest DNS to configure, use, update, and operate. It's especially efficient for networks with frequent updates -- serving DHCP, for example. Updates to the zones are immediate, and do not require restarting sheerdns. SheerDNS is a good candidate for creating and RBL for mail, or web sites, as well as for providing DNS on embeded systems. Or anything else that requires a fast DNS, with very low overhead.

Hexedit is a Curses based Hex editor. Unlike a text editor, which is used for editing text documents in the desired language, hexedit lets you edit any file as it's byte(1) for byte representation. It can even let you view and edit your fixed disks on your Linux system. This is not ideal for writing a letter or writing c code, but there are my times when this is ideal: * Editing binary executables. * Editing your fixed disks (i.e. /dev/xyz) * Checking the output of a Program's binary data file. * Any place you might use od(1) but need more power. Compare more vs less.

Diakonos, the console text editor with a key mapping you practically already know. Easy to use and easy to configure, but potent in the hands of power users.