Neso Academy provides meticulously organized notes that mirror their video presentations.
While you cannot download an "operating system" made by Neso, you can access their entire library of OS tutorials for free on . For those looking for offline access, Neso Academy offers: neso academy operating system free download
To clarify:
Because Neso Academy is an educational platform (similar to Khan Academy or Coursera), they do not have a single "downloadable" software program called "Operating System." Instead, they offer a course that includes video lectures, notes, and quizzes. neso academy operating system free download
The primary way to access the content for free is via their YouTube channel or website. neso academy operating system free download