This is where Ciro Santilli stored his code since he started coding nonstop in 2013.
He does not like the closed source aspect of it, but hey, there are more important things to worry about, the network effect is just too strong.
Some amazing people have put book source codes on GitHub. This is a list of such repos.
The cheapest and most resilient way to publish text content humanity has achieved so far.
The heart/main innovation of GitHub!