Arpwatch is described as 'arpwatch is a computer software tool for monitoring Address Resolution Protocol traffic on a computer network. It generates a log of observed pairing of IP addresses with MAC addresses along with a timestamp when the pairing appeared on the network' and is an website in the Security & Privacy category. There are seven alternatives to Arpwatch, not only websites but also apps for Windows, Linux, Android and PyQt. The best alternative is NetCut, which is free. Other great sites and apps similar to Arpwatch are ARP Monitor (Free), XArp (Free), TuxCut (Free, Open Source) and elmoCut (Free, Open Source).
NetCut is a Software that helps you admin your network by purely on ARP protocol. List IP-MAC Table in secs, turn off & on network on any computer on your LAN including any device like router, switcher.
It’s FREE tool like arpwatch but for Windows OS. This tool can help with ARP activity monitoring in computer networks. This windows software monitors ethernet activity like unix apwatch and keeps a database of ethernet/ip address pairings.