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+FreeDV is a Digital Voice mode for HF radio.
+
+You can run FreeDV using a free GUI application for Windows, Linux and
+OSX that allows any SSB radio to be used for low bit rate digital
+voice. Alternatively you can buy a SM1000 FreeDV adaptor that allows you
+to run FreeDV on any HF radio without a PC or sound card.
+
+Speech is compressed down to 700-1600 bit/s then modulated onto a
+.25 kHz wide signal comprised of 16 QPSK carriers which is sent to the
+Mic input of a SSB radio. The signal is received by an SSB radio, then
+demodulated and decoded by FreeDV. FreeDV 700C is approaching SSB in
+its low SNR performance. At high SNRs FreeDV 1600 sounds like FM,
+with no annoying analog HF radio noise.
+
+FreeDV was built by an international team of Radio Amateurs working
+together on coding, design, user interface and testing.
+FreeDV is open source software, released under the GNU Public License
+version 2.1. The modems and Codec 2 speech codec used in FreeDV are
+also open source.