Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
Axonius - Cyber security asset management to see and secure all
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.
Armis - The leading enterprise-class agentless device security platform to address the new threat landscape of unmanaged and IoT devices.
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
runZero - runZero is a comprehensive cyber asset attack surface management solution with the fastest and easiest way to full asset inventory. Gain essential visibility and insights for every asset connected to your network.