NETworkManager by BornToBeRoot - A powerful tool for managing networks and troubleshoot network problems!
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
MiTec Network Scanner - A free multi-threaded ICMP, Port, IP, NetBIOS, ActiveDirectory and SNMP scanner with many advanced features.
Network Analyzer - Network Analyzer app lets users discover new high-speed WiFi networks to connect to them and download files of big sizes in a matter of seconds.
Fingbox - Fingbox home network security device helps you keep your internet safe and secure, allows you to monitor your household digitally and improve your home Wi-Fi experience.