Download of ArpON 3.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The software lies within Internet & Network Tools, more precisely Network tools. The actual developer of this free Mac application is Andrea Di Pasquale.
From the developer:
ArpON (Arp handler inspectiON) is a portable ARP handler. It detects and blocks all ARP poisoning/spoofing attacks with the Static Arp Inspection (SARPI) and Dynamic Arp Inspection (DARPI) approaches on switched/hubbed LAN with/without DHCP protocol.
You may want to check out more software for Mac, such as PPPoE Connector, tn3270 or Remote Connections Manager, which might be related to ArpON.