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adns is a resolver library for C (and C++) programs. In contrast with the existing interfaces, gethostbyname et al and libresolv, it has the following features: * It is reasonably easy to use for simple programs which just want to translate names to addresses, look up MX records, etc. * It can be used in an asynchronous, non-blocking, manner. Many queries can be handled simultaneously. Technical note: adns requires a real nameserver like BIND or Dents running on the same system or a nearby one, which must be willing to provide `recursive service'. I.e., adns is a `stub resolver'.

DNSCheck is a program that is designed to help people check, measure and hopefully also understand the workings of the Domain Name System. When used to check an domain (aka zone) is submitted to DNSCheck, it will investigate the general health by performing various tests and sanity checks.

liburcu is a LGPLv2.1 userspace RCU (read-copy-update) library. This data synchronization library provides read-side access which scales linearly with the number of cores. It does so by allowing multiples copies of a given data structure to live at the same time, and by monitoring the data structure accesses to detect grace periods after which memory reclamation is possible.

NSD (Name Server Daemon) is a complete implementation of an authoritative DNS nameserver.

This port contains a subset of the DJBDNS package. It includes several useful Domain Name System (DNS) tools: - dnsfilter: a parallel IP-address-to-host-name converter - dnsip, dnsipq, dnsname, dnstxt, and dnsmx: simple command-line interfaces to DNS - dnsq, dnstrace, dnstracesort: DNS debugging tools

To quote from the SourceForge project description: gh-tool is a command-line interface to gethostby*, in libresolv/libc. It allows one to check the local system's notion of an IP->DNS or DNS->IP mapping, including aliases, directly, rather than digging for mappings in DNS, which may or may not be relevant.

CurveDNS is a forwarding nameserver adding DNSCurve to DNS, and it's the first publicly released forwarding implementation that implements the DNSCurve protocol.

pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS requests and name resolutions asynchronously.