Automated black-box website security assessment. Prompt result. Different scan modes, depth, and quality. Choose free-of-charge on-demand testing or cheap subscription to 24/7 monitoring
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
Fing - Discover which devices are connected to any Wi-Fi network, map devices, detect intruders, assess...
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.
Zenmap - Zenmap is the official cross-platform GUI for the Nmap Security Scanner.
Network Radar - IP scanner and network monitoring tool for Mac