EchoHam 2.29 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The following version: 1.1 is the most frequently downloaded one by the program users.
We recommend checking the downloaded files with any free antivirus. The software lies within Audio & Video Tools, more precisely Editors & Converters. This free Mac application is a product of Control Technologies Pty Ltd. The latest version of the program is supported on Mac OS X 10.7 or later.
From the developer:
EchoHam allows Amateur Radio operators to use the Echolink network from their iMac. You must be a licensed Amateur Radio operator to use this software. If you are new to the EchoLink system, after running EchoHam for the first time, please validate your call sign.
You may want to check out more Mac applications, such as Norrkross Movie, Xmart Volume or Aiseesoft iPhone Ringtone Maker for Mac, which might be related to EchoHam.