Simple VLF receiver using PC soundcard with direct sampling.

Play digital samples on your Commodore 16/116/+4

A .ino project for SAMD21 Arduinos tested on Arduino Zero that allows conversion of Analog values into PWM duty cycle, tested frequencies are 0.00281hz-200khz

Covox Sound Master detection and test utility

a set of USB sound / DCF77 tools

A C++ addon for node.js that allows interacting with soundcards to e.g. play, record or process live microphone samples and send them back to the speakers.