Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
Wireless Network Watcher - scans your wireless network and displays the list of all computers and devices that are currently connected to your network.
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
Aircrack-ng - Aircrack-ng is an 802.
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.
My WIFI Router - Wifi Hotspot creator for Windows