gMFSK is a multimode HF terminal program for Linux and other unix-like
operating systems. Despite the name, gMFSK can send and receive many digital
conversational modes typically used by radio amateurs on HF. Supported
modes are:

     * MFSK (MFSK16 and MFSK8)
     * RTTY
     * THROB (1, 2 and 4 throbs/sec)
     * PSK31 (BPSK and QPSK)
     * PSK63
     * MT63
     * Feldhell