About Anki
Anki is a free and open-source flashcard program / app. It helps you remembering stuff by using spaced repetition: One of the most effective learning methods backed by science. To get started, visit the Anki website to download the app and watch an intro. If you need help, visit the Anki community on Reddit.
My Decks
You can get a lot of shared decks by Anki users for free on AnkiWeb. I myself have put together 2 Anki decks so far, which are out for you to grab. Here is an overview:
Countries of the World
A deck covering all 198 countries and 50 dependencies given ISO-Codes by the UN. Includes maps, capitals, flags and more.
Languages:
United States of America
A deck to learn the 50 states of the United States of America with capitals, maps and more.
Languages:
