The Free & Popular opendhcp application for Physical & Virtual Machine
TraceMAC is a command-line Layer 2 traceroute for Cisco switches
Full features for Dolphin's right click menu on KDE [4.x|5.x]
Programmable completion code (bash) for ip[6]tables (netfilter.org)
A simple, handy network addressing multitool with plenty of features.
Brute-forcing WAN/LAN services
Programmable completion code (bash) for ipset (netfilter.org)