LanCalculator
LanCalculator - IP Subnet Calculator for IPv4/IPv6 Networks - LizardSystems
4 Alternatives To LanCalculator
Authority
Authority is a straightforward and affordable email migration solution that allows you to move from your current email platform to new platform without using Authority as you archive.
LanDroid
Robotic grass mover (Roomba for your lawn)
Ship
Fast, native issue tracking for software projects
whatmask
Whatmask is a small C program that will help you with network settings and subnet calculations.