Non-profit corporation dedicated to developing and maintaining production quality open source reference implementations of core Internet protocols. BIND is available here for free.

The developer's site for the Berkeley Internet Name Daemon at the Internet Software Consortium.

Examples and howtos for djbdns.

The Network Information Service (NIS) provides a simple network lookup service consisting of databases and processes. It was formerly known as Sun Yellow Pages (YP).

QuickDNS and DNS Expert tools. Free trial versions, support page including DNS glossary, FAQ, mailing list. [MacOS, Windows]

DNS and DHCP server software for MS Windows, Linux, and Solaris.

Documentation and support for this product. Service packs and updates available.

PowerDNS is a non-BIND nameserver based on open-source and proprietary software.

Free trial version, screenshots, client testimonials, FAQ, tutorials. Also provides a Web-based DNS lookup tool.[Windows]

Free Perl package that allows dynamic DNS update using your DHCP server. GPL license. News, and a glossary of relevant technical terms.