NetCut - NetCut is a Software that helps you admin your network by purely on ARP protocol.

Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.

CSArp-Netcut - An arpspoofing program that lets users launch spoofed arp requests to disrupt connections in a LAN

Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use

SelfishNet - Block anyone or any device from using your internet

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.