Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
ipcalc - IP Calculator. ipcalc takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range. By giving a second netmask, you can design subnets and supernets....
TcpView For Linux - TcpView For Linux. Touch screen friendly design graphical network connections viewer for Linux.
Subnetter - Split IPv4 network ranges
TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
LanCalculator - LanCalculator - IP Subnet Calculator for IPv4/IPv6 Networks - LizardSystems