Free internet radio software for linux

Internet DJ console is a graphical shoutcast and icecast client that runs under GTK+ and the JACK audio connection kit. In short, its an Internet radio app for making a live radio show.
Features include two main media players with a crossfader, a jingle player, microphone signal processing (compressor and noise gate), IRC track announcements with X-Chat, an automatic stream shut-off timer, MP3 or Ogg streaming at various bit rates, aux input for connecting any audio app that is compatible with JACK, and various audio level meters.
Enhancements:
- A new, more powerful streaming architecture has been implemented with multiple streams possible, greater control over quality settings, ability to change the bitrate live on air, and the ability to stream from a prerecorded file with the metadata preserved.
- The MP3=UTF8 option has been removed, and CPU load is now reduced when the microphone is off.

GNU Radio is a collection of software that when combined with minimal hardware, allows the construction of radios where the actual waveforms transmitted and received are defined by software. What this means is that it turns the digital modulation schemes used in todays high performance wireless devices into software problems.
What is a Software Defined Radio?
Joe Mitola says, "A software radio is a radio whose channel modulation waveforms are defined in software. That is, waveforms are generated as sampled digital signals, converted from digital to analog via a wideband DAC and then possibly upconverted from IF to RF. The receiver, similarly, employs a wideband Analog to Digital Converter (ADC) that captures all of the channels of the software radio node. The receiver then extracts, downconverts and demodulates the channel waveform using software on a general purpose processor."
For our purposes, on the receive side, the idea is to get a wide band ADC as close to the antenna as is convenient, get the samples into something we can program, and then grind on them in software.
Enhancements:
- GNU Radio 2.6 includes sending and receiving data at up to 1Mbit/sec using GMSK. - Theres also support for the new USRP Flex 400 transceiver daughterboards.
- Handling of all daughterboards has been unified, so most apps will work without modification on any of them. For those of you interested in wireless networking, see especially gnuradio-examples/python/gmsk2. Weve got a framework in place to allow you to build and experiment with your own MACs. 2.6 includes the "null MAC". A carrier sense MAC is the next logical step.

Internet Storm Center is a clone of the simple little Windows Konfabulator ISCTracker widget by Bob Rudis. It puts a little coloured globe on your desktop, with the colour of the land corresponding to the current level of Internet Storm Tracker.

Clicking on the globe takes you directly to isc.sans.org.

Gnomeradio is a FM radio tuner for the GNOME desktop (version 1 and 2).

Gnomeradio is an FM radio tuner application. It should work with every FM tuner card that is supported by video4linux. Remote controls are supported via (optional) lirc-support. Gnomeradio can also record radio as a Wave or MP3 file.