"This page features a growing list of Free Philosophy eBooks, presenting essential works by Aristotle, Hegel, Kant, Nietzsche, Wittgenstein and many other philosophers. You can generally read these texts on your Kindle, iPad & iPhone, or web browser. For those interested in philosophy, you won’t want to miss our collection of Free Online Philosophy Courses."
https://www.openculture.com/free-philosophy-ebooks
https://www.openculture.com/free-philosophy-ebooks