PowerDNS - PowerDNS offers open source DNS software, services, and support.
Squid Proxy - Website Content Acceleration and Distribution. Thousands of web-sites around the Internet use Squid to drastically increase their content delivery. Squid can reduce your server load and improve delivery speeds to clients.
dnsmasq - Dnsmasq is a lightweight, easy to configure DNS forwarder and DHCP server.
CCProxy - Want to share Internet connection? Get every computer online through a single Internet connection?
Unbound - Unbound is a validating, recursive, and caching DNS resolver.
Apache Traffic Server - Fast, scalable and extensible HTTP/S 2 and 1.1 compliant caching proxy server.