I am looking for books like this
Operating Systems: Three Easy Pieces (http://pages.cs.wisc.edu/~remzi/OSTEP/). The book is high quality yet free.
Ask HN: DRM Free Technical Books
1–2 of 2 posts
Re: Ask HN: DRM Free Technical Books
#2Not sure if you've seen this,
https://github.com/EbookFoundation/free-programming-books/bl...
Edit,
There's also, https://www.reddit.com/r/csbooks/