Qtmm is a very simple AFSK1200 decoder that uses the soundcard as input device. Connect your computer to the audio output of tyour FM receiver, select the input device from the list and start decoding packet radio transmissions such as APRS traffic or telemetry from various cubesats.
Qtmm uses the multimon AFSK1200 engine by Thomas Sailer and the Qt toolkit from Nokia. Qmm is available for Linux, Mac OS X and Windows.

The license of this software is Free, you can free download and free use this audio utility software.