The Pliant language, and the FullPliant operating system, are free software of which I am the author, and which I have been making available for 20 years.
Folding, it's classic computing, but well built, that is to say with a lot of thought on the concepts, and less than 200,000 lines of code for the whole thing, where standard computing is But Pliant also shows that distribution, including free computer software, is more about marketing than technical merit, which I clearly ignored.