Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
Qualys - Qualys helps your business automate the full spectrum of auditing, compliance and protection of your IT systems and web applications.
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
Symantec Cloud Workload Protection - Symantec Cloud Workload Protection enables business agility and cost savings by automating security for public cloud workloads. Visit Symantec to learn 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.
Google Cloud Platform Security Overview - Cloud Workload Protection Platforms