Simple effective ARP spoofer with scapy
I don't know if this will work on any other system. It works well on my Kali linux but code is hackish so just fix it if you have a problem. Shows ARP spoofing in scapy nicely.
Simple use such as:
./arpspoof.py -t 5
This will arpspoof x.x.x.5 on your network sending requests to the target and replies to the router. Classic MiTM using ARP packets.