Avahi is a framework for Multicast DNS Service Discovery (mDNS/DNS-SD a.k.a. Zeroconf) on Linux. It allows programs to publish and discover services running on a local network with no specific configuration. For example, you can plug into a network and instantly find printers to print to, files to look at, and people to talk to.
djbdns is a collection of Domain Name System tools. Security is one of the primary motivations for the development of djbdns. Every step of the design and implementation has been carefully evaluated from a security perspective. The djbdns package has been structured to minimize the complexity of security-critical code. dnscache is immune to cache poisoning. It is advisable to use the package as a secure alternative to BIND.
Aletheia is a browser-like application for sending raw HTTP requests. It is designed for debugging and finding security issues in Web applications. It is possible to apply filters on every request and response which can modify the content, for making Basic Authentication or OAuth requests, for example. Because it is possible to modify every bit of the request, it is easy to exploit Web applications. That means you can set, for example, custom Cookies or User-Agents, or send file uploads to the server. It uses the Apache HTTP core components library to send HTTP requests. This application also helps you understand how the HTTP protocol works.
namebench finds the best DNS servers to use for your machine, benchmarks them, and outputs pretty graphs to tell you why they are optimal. It supports multiple data sources such as Alexa, your browser history, or tcpdump replays in order to generate the most relevant and individualized recommendation.
adsuck is a small DNS server that spoofs blacklisted addresses and forwards all other queries. The idea is to be able to prevent connections to undesirable sites such as ad servers, crawlers, etc. It can be used locally, for the road warrior, or on the network perimeter in order to protect local machines from malicious sites.
DNRD is a proxy DNS daemon. It supports several forward servers for redundancy and/or load-balancing. DNS queries for specific domains can be forwarded to a specific group of DNS servers (with redundancy and load balancing) for that domain. It is very useful in VPN and dialup environments but can also be used as a DNS cache or ad-blocker for networks and workstations.
ldap2dns is a program to read DNS (Domain Name Service) records from an LDAP directory and format them into flat files suitable for TinyDNS (or Bind). ldap2dns reduces all kinds of administration overhead: no more flat file editing, no more zone file editing. After having installed ldap2dns, the administrator only has to modify the data stored in the LDAP directory. Access control can be configured for each zone, GUIs can be more easily implemented, and all other kinds of zone and resource record information can be managed without interfering with the DNS server directly.
Poweradmin is a friendly Web-based DNS administration tool for Bert Hubert's PowerDNS server. The interface has full support for most of the features of PowerDNS including all zone types (master, native, and slave), supermasters for automatic provisioning of slave zones, full support for IPv6, and support for multiple languages.