Smit is a simple ARP hijacking tool for switched and unswitched networks. The source is based on arpmitm and arprelay and includes nice features such as automatic ARP MAC query and an improved MAC cache consistence algorithm. You can also run Smit in transproxy-only mode and use your favourite sniffer to capture ‘hijacked’ packets on switched networks.
You can download it from the following link: https://packetstormsecurity.com/files/download/22243/smit.tar.gz
Source: https://packetstormsecurity.com/files/22243/smit.tar.gz.html