Fing is recommended for home users, IT professionals, and small to medium-sized businesses that need to monitor their network security and performance. It's particularly useful for users who want to keep track of all devices connected to their network and ensure optimal network functionality.
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
Ettercap - Ettercap is a suite for man in the middle attacks on LAN.
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.
SmartSniff - SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.