Download of WiFiPerf 2.0 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Internet & Network Tools, more precisely Network tools.
The most popular versions among the program users are 1.6, 1.5 and 1.1. This Mac application is an intellectual property of AccessAgility. We recommend checking the downloaded files with any free antivirus. This application was developed to work on Mac OS X 10.6 or later.
From the developer:
WiFiPerf is a network performance app from AccessAgility LLC for testing wireless or wired bandwidth between Macs or between Macs and iOS devices.
You may want to check out more Mac applications, such as LaCie Ethernet Agent, Covenant Eyes or AirGrab Network Packet Analyzer, which might be related to WiFiPerf.