Who codes open source software?

When I wrote "The Programmer's Odyssey" I hoped to include research in it about the programmers who give their unpaid time to create open source software (OSS) but as I failed to find any such research my section called "Open Source" in the book is very short.

So recently when Wily Business (@WilyBusiness) tweeted about research into Open Source Hardware (OSH) that included links to Open Source Software (OSS) research it seemed like I'd belatedly found what I'd once looked for and I found it at https://onlinelibrary.wiley.com/doi/epdf/10.1111/radm.12348.

It references several quite intensive OSS research papers so I am now reviewing them all and will create the paragraph length summary I originally wanted to include in my book, which I will post.

So watch this space.