Download of iPerf2 1.4 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. The program lies within Internet & Network Tools, more precisely Network tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This software for Mac OS X was originally developed by AccessAgility.
From the developer:
iPerf2 is a bandwidth performance measurement app for iOS and Mac OS. The app can operate as a client and/or server. iPerf2 can be used for Mac OS-to-Mac OS testing, Mac OS-to-iOS testing or iOS-to-Mac OS testing. iPerf2 should work with other operating systems that support iPerf2.x
You may want to check out more software for Mac, such as Flame, Countdown utility or ZOC Terminal, which might be similar to iPerf2.