EchoMac For Mac Publisher's description
EchoMac is a client program ....
EchoMac is a client program for OS X that allows connection to the Echolink system. It is built as a Universal Binary, and works on OS X 10.3.9, 10.4.11, 10.5.x, or 10.6.x.
System Requirements:* OS X 10.3.9 or later with the BSD Subsystem
* Audio input device (selected by Sound preference pane before launching EchoMac)
* Internet connection
Program Release Status: Minor Update
Program Install Support: Install and Uninstall