Dns Jumper - DNS Jumper is a portable freeware App which makes changing your DNS settings as easy as clicking a button , it is the world's first IPv6 supported Dns tool
GRCs DNS Benchmark - DNS Nameserver Performance Benchmark
namebench - Provides personalized DNS server recommendations based on your browsing history.
NetSetMan - Are you tired of changing your network configuration on your laptop every day?
Duck DNS - Free dynamic DNS hosted on Amazon VPC
TCP/IP Manager - Designed to help computer users keep track of their network configuration in different locations.