Kon-Boot - Kon-Boot is a password hacking, password recovery tool for Windows and Mac.
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
John the Ripper - A fast password cracker for Unix, macOS, Windows, DOS, BeOS, and OpenVMS
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
Password Recovery Bundle - Quickly recover or reset passwords for Windows, PDF, ZIP, RAR, Office Word/Excel/PowerPoint documents. Retrieve passwords for instant messengers, email accounts, web browsers, FTP logins, and more.
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.