d-tools provides some useful tools for working with the D programming language. In the output out are:

• ddemangle (demangles D symbols)

• dustmite (reduces D-like source code to mimimally reproduce some test case)

• rdmd (runs D source files as scripts)

In the internal output are:

• catdoc (concatenates Ddoc files)

• changed (change log generator)

• checkwhitespace (checks for correct whitespace usage in source files)

• contributors (query contributors between two D releases)

• detab (replace tabs with spaces, and remove trailing whitespace from lines)

• dget (D source code downloader)

• tolf (line endings converter)

hnsd is a host name resolver for the Handshake Naming System (HNS) peer-to-peer network.

C-ares is a C library that performs DNS requests and name resolution asynchronously. It is intended for applications which need to perform DNS queries without blocking, or need to perform multiple DNS queries in parallel. The primary examples of such applications are servers which communicate with multiple clients and programs with graphical user interfaces.

Knot Resolver is a caching full resolver implementation written in C and LuaJIT, both a resolver library and a daemon.

MaraDNS is a small and lightweight DNS server. MaraDNS consists of a UDP-only authoritative DNS server for hosting domains, and a UDP and TCP-capable recursive DNS server for finding domains on the internet.

GNU adns is a C library that provides easy-to-use DNS resolution functionality. The library is asynchronous, allowing several concurrent calls. The package also includes several command-line utilities for use in scripts.

This command line tool to update Cloudfare DNS records is useful for tasks such as updating dynamic DNS records or updating DNS records for the ACME DNS-01 protocol.

DNSSEC-Trigger enables your computer to use DNSSEC protection for the DNS traffic. It relies on the Unbound DNS resolver running locally on your system, which performs DNSSEC validation. It reconfigures Unbound in such a way that it will signal it to to use the DHCP obtained forwarders if possible, fallback to doing its own AUTH queries if that fails, and if that fails it will prompt the user with the option to go with insecure DNS only.

This is the Public Suffix List maintained by Mozilla. A "public suffix" is one under which Internet users can (or historically could) directly register names in the Domain Name System (DNS). Some examples of public suffixes are .com, .co.uk and pvt.k12.ma.us. This is a list of all known public suffixes.

ddclient is used to update dynamic DNS entries for accounts on many dynamic DNS services. It supports a wide range of routers and protocols, including Cloudflare, Namecheap, DynDNS, FreeDNS, Google Domains, and many more.

Avahi is a system which facilitates service discovery on a local network. It is an implementation of the mDNS (for "Multicast DNS") and DNS-SD (for "DNS-Based Service Discovery") protocols.

Dnsmasq is a light-weight DNS forwarder and DHCP server. It is designed to provide DNS and, optionally, DHCP to a small network. It can serve the names of local machines which are not in the global DNS. The DHCP server integrates with the DNS server and allows machines with DHCP-allocated addresses to appear in the DNS with names configured either on each host or in a central configuration file. Dnsmasq supports static and dynamic DHCP leases and BOOTP/TFTP for network booting of diskless machines.

SmartDNS is a DNS server that accepts DNS query requests from local clients, obtains DNS query results from multiple upstream DNS servers, and returns the fastest access results to clients.

openresolv is an implementation of resolvconf, the middleman between the network configuration services and /etc/resolv.conf. resolvconf itself is just a script that stores, removes and lists a full resolv.conf generated for the interface. It then calls all the helper scripts it knows about so it can configure the real /etc/resolv.conf and optionally any local nameservers other than libc.

Knot DNS is an authoritative name server for the Domain Name System (DNS), designed to meet the needs of root and top-level domain (TLD) name servers. It is implemented as a threaded daemon and uses a number of programming techniques to improve speed. For example, the responder is completely lock-free, resulting in a very high response rate. Other features include automatic DNS Security Extensions (DNSSEC) signing, dynamic record synthesis, and on-the-fly re-configuration.

dnscrypt-wrapper is a tool to expose a name server over the dnscrypt protocol. It can be used as an endpoint for the dnscrypt-proxy client to securely tunnel DNS requests between the two.

LDNS aims to simplify DNS programming, it supports recent RFCs like the DNSSEC documents, and allows developers to easily create software conforming to current RFCs, and experimental software for current Internet Drafts. A secondary benefit of using ldns is speed; ldns is written in C it should be a lot faster than Perl.

BIND implements the DNS protocols for the Internet. It is both a reference implementation of those protocols and production-grade software, suitable for use in high-volume and high-reliability applications.

The name stands for "Berkeley Internet Name Domain" because the software originated in the early 1980s at the University of California at Berkeley.

The utils output of this package contains the following command line utilities related to DNS name servers:

delv

DNS lookup and validation utility

dig

DNS lookup utility

host

DNS lookup utility

nslookup

Internet name servers interactive query utility

nsupdate

Dynamic DNS update utility

libmicrodns provides a minimal implementation of a mDNS resolver as well as an announcer. mDNS (Multicast Domain Name System) is a zero-config service that allows one to resolve host names to IP addresses in local networks.

YADIFA is an authoritative name server for the Domain Name System (DNS). It aims for both higher performance and a smaller memory footprint than other implementations, while remaining fully RFC-compliant. YADIFA supports dynamic record updates and the Domain Name System Security Extensions (DNSSEC).

dnscrypt-proxy is a tool for securing communications between a client and a DNS resolver. It verifies that responses you get from a DNS provider was actually sent by that provider, and haven't been tampered with. For optimal performance it is recommended to use this as a forwarder for a caching DNS resolver such as dnsmasq, but it can also be used as a normal DNS "server". A list of public dnscrypt servers is included, and an up-to-date version is available at https://status.dnscrypt.info/.

NSD, short for Name Server Daemon, is an authoritative name server for the Domain Name System (DNS). It aims to be a fast and RFC-compliant nameserver.

NSD uses zone information compiled via zonec into a binary database file (nsd.db). This allows fast startup of the name service daemon and allows syntax-structural errors in zone files to be flagged at compile time, before being made available to NSD service itself. However, most traditional BIND-style zone files can be directly imported into NSD without modification.

The collection of programs and processes that make up NSD are designed so that the daemon itself runs as a non-privileged user and can be easily configured to run in a chroot jail, thus making any security flaws in NSD less likely to result in system-wide compromise.

Dnsupdate is a dynamic DNS client that provides support for multiple DNS services, including Afraid.org FreeDNS, Cloudflare, IETF standard DNS updates (nsupdate), and custom HTTP-based services. It uses YAML configuration files and supports multiple address detection methods.

Unbound is a recursive-only caching DNS server which can perform DNSSEC validation of results. It implements only a minimal amount of authoritative service to prevent leakage to the root nameservers: forward lookups for localhost, reverse for 127.0.0.1 and ::1, and NXDOMAIN for zones served by AS112. Stub and forward zones are supported.