SignaLink
From PBARC
A SignaLink is a device used to connect a computer to a radio transciever for digital modes and SSTV. The current and most popular model, the SignaLink USB, has a built-in USB sound card; it connects directly to a computer via USB. It connects to the radio by a specialized cable made specifically for that particular model of radio. The SignaLink USB works with Linux, Windows, and Mac.