The site's official app provides access to the catalog of more than 32 million disputable articles, each offered in more than 280 languages. It has additional options for quickly sharing articles on social networks or saving for offline use.
With more than 200 free courses covering more than 20 subjects, Coursera allows you to engage in a variety of courses from universities and institutions around the globe. Enroll in classes, stream and download lectures and watch content.
This app provides more than 4,000 free downloadable videos on a variety of subjects including high school math and science to art history and computer science. You can also track your progress and unlock basic achievements.
This app allows you to scan and convert physical documents (like pages and pages of notes!) into PDFs, which you can then email, print or upload. The app can automatically detect edges and borders, keeping cropping to a minimum.