The first podcast was Christopher Lydon’s Radio Open Source. The term podcast was created to describe it. It’s still going strong. If you like ideas, books, music, vaguely leftish politics you might like it.
It has nothing to do with open source software.
I used to work at a company that did distributed QA. Other people’s tests would run on your desktop. It worked surprisingly well. But occasionally a test of some audio resource would play on your speakers “The discrete cosine is a real, discrete version of the fast Fourier transform.”