RadioBar is a Menu Bar only app to let you listen to various radio stations on your Mac.
Odio lets you listen to thousands of radio stations on major desktop platforms.
Radio Tray Lite lets you play online radio with minimum options and interface on your Linux machine.
Tray Radio places a small icon in your system tray and lets you play your music tracks and radio using that icon.
LadioCast lets you stream internet radio programs and other broadcasts easily on your Mac.