Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
HackenProof - The world trusted Bug Bounty Platform for crypto projects
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.
Axonius - Cyber security asset management to see and secure all
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
PentestHero.io - Your pentest partner in the cloud