ophcrack - Ophcrack is a Windows Password cracker based on Rainbow Tables. Features
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
Kon-Boot - Kon-Boot is a password hacking, password recovery tool for Windows and Mac.
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
hashcat - The World's Fastest CPU/GPU powered password cracker.
Advanced IP Scanner - Advanced IP Scanner shows all network devices, gives you access to shared folders, and can even remotely switch computers off. Download it Free.