For non-hams reading this and wondering what it on earth it is, it's essentially an open source implementation of Echolink, a internet-connected network of amateur VHF/UHF repeaters. Normally when you transmit to an amateur radio repeater, the repeater re-transmits your audio on a different frequency so that it can be heard by a wider coverage area than your radio could be.<p>Echolink has (at least) four main functions:<p>1. It allows repeater owners to link two or more repeaters together over the Internet so that a transmission into one repeater results in a transmission _out_ of multiple repeaters, effectively giving your transmission wider coverage, or coverage in multiple geographical locations.<p>2. The Echolink clients allow licensed amateur radio operators to receive and transmit on VHF/UHF repeaters around the world from their desktop or mobile devices.<p>3. The Echolink server allows amateur radio operators to turn their own radios into internet-connected nodes so that they can access them away from home, or allow others to use their radios over the Echolink network.<p>4. The Echolink network has topic-specific conference rooms that hams can join with their client. Or, repeater owners can temporarily have their repeater join a conference room. For example, there is almost certainly one or more dedicated to the hurricane events happening in the southern US right now.<p>The "official" Echolink client and server software is closed-source, this is an open source implementation.<p>You need to have an amateur radio license to sign up for an account on the Echolink network, because anything you transmit into the network might go out over the airwaves somewhere and you need a license and call sign to do that.