With a small codebase, the PowerDNS Recursor is an advanced resolver currently serving the DNS resolving needs of over 80 million Internet connections. Besides high performance (using kqueue or epoll, over 100 thousand qps on commodity hardware), it provides advanced anti-spoofing measures. In addition, the program caches server performance and timeouts, making it both network and user friendly. It also has built-in hooks for making graphs with rrdtool, providing insight into nameserver performance.
Collax Business Server is an all-in-one Linux server for small- and medium-sized businesses. It delivers all the important network services within a heterogeneous business environment for communication, infrastructure, compliance, groupware, and storage, all in a reliable and secure way which is easy to manage. It also provides essential security functions such as firewalling and virus and spam filtering, to protect against hacker attacks, viruses, and unsolicited email messages.
The Collax Security Gateway is a Unified Threat Management (UTM) Solution for small- and medium-sized businesses. It includes an easy to configure stateful inspection firewall, email security features including anti-spam and anti-virus, Internet access control, Internet SSL interception, Internet networking optimization tools, Internet network fault tolerance, clientless VPN technology, and remote administration.
The Berkeley Internet Name Domain (BIND) implements an Internet name server for Unix operating systems. The BIND consists of a server (or `daemon') called `named' and a suite of associated tools and libraries. A name server is a network service that enables clients to name resources or objects and share this information with other objects in the network via the Domain Name System (DNS).
s6-dns is a small, efficient, complete, and IPv6-ready DNS client library, with synchronous as well as asynchronous APIs. It is designed to replace libresolv in projects that need to perform DNS resolution. It also comes with small command-line utilities to make common and not so common DNS queries.