dnsmasq - Dnsmasq is a lightweight, easy to configure DNS forwarder and DHCP server.
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
YogaDNS - YogaDNS automatically intercepts DNS requests at the system level and allows you to process them...
memcached - High-performance, distributed memory object caching system
BIND - BIND is by far the most widely used DNS software on the Internet.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.