Arpwatch is described as '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 a network analyzer in the security & privacy category. There are seven alternatives to Arpwatch, not only websites but also apps for a variety of platforms, including Windows, Linux, Android, iPhone and iPad apps. The best Arpwatch alternative is NetCut, which is free. Other great sites and apps similar to Arpwatch are CSArp-Netcut, elmoCut, TuxCut and ARP Monitor.
NetCut is a Tool helping Discover who is on your wireless/Wire network instantly. (IP/Device name/MAC address), Iphone/Xbox/Wii/PS3andriod/andriod
NetCut is the most popular Windows, Android & Mac alternative to Arpwatch.
NetCut is the most popular free alternative to Arpwatch.
An arpspoofing program that lets users launch spoofed arp requests to disrupt connections in a LAN.
CSArp-Netcut is the most popular Open Source alternative to Arpwatch.
Eye candy ARP spoofer for Windows. elmoCut aims to make arp spoofing easy for all users with all the hard work done under the hood.
TuxCut is the most popular Linux alternative to Arpwatch.
It’s FREE tool like arpwatch but for Windows OS. This tool can help with ARP activity monitoring in computer networks.
XArp – Advanced ARP Spoofing Detection
XArp performs advanced ARP spoofing detection mechanisms – made to secure your network.
A tweak for jailbroken idevices that does arp spoofing. See reddit page for info on use.
Netkillui is the most popular iPhone & iPad alternative to Arpwatch.
Taiwan
