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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...
SoftPerfect Network Scanner - Powerful multipurpose network administration tool for Windows and macOS
iNet - Network Scanner - Explore your network !
Port Authority - A handy systems and security-focused tool, Port Authority is a very fast Android port scanner.