Create flashcards, games, and quizzes from your study guides with the following tools. Some are only available on certain platforms, so search your app store:
Evernote: Allows you to merge photos, typed notes, and links into one notebook (also available as an app)
OneNote: Allows you to keep all Microsoft files in the same notebook
Share your board (allows you to take pictures of white boards in your class and adjusts for the color balance)
Notability: Keep both hand-written and typed notes in the same file and allow users to provide audio feedback
If you use Google Chrome as your browser, you can annotate and save various web pages with notes of your own.