Anki is available as a web version or downloadable app. It is used to make flashcard type revision cards which you can make yourself or you can import decks of cards made by someone else.
See https://ankiweb.net/about for more details. My decks only work with the original Anki (desktop), Ankiweb and Ankidroid (app) and not the copycat version called AnkiApp.
Once you have the app you can download the files below and add them to your own decks.
Expert Physics Tutor 