Simple chat program using near ultrasonic frequencies. Works without Wifi or Bluetooth and won't show up in a pcap.
Note: If you can clearly hear the send script working then your speakers may not be high quality enough to produce sounds in the near ultrasonic range.
run python send.py in one terminal window and python listen.py in another. Text you input into the send.py window should appear (after a delay) in the listen.py window.
Warning: May annoy some animals and humans.
Quietnet is dependant on pyaudio and Numpy.
Quietnet is just a toy! Take a look at minimodem or gnuradio if you need something robust.