I recently built a spaced-repetition module in learnawesome.org to help users practice and remember not just from whatever they're reading, but also by taking notes from meetings, conferences, videos etc. Wrote an article about it: https://medium.com/learn-awesome/practice-what-you-learn-usi...

Since learnawesome.org is open-source, if anyone needs a Ruby/Rails implementation of spaced-repetition algorithm, feel free to take code from here: https://github.com/learn-awesome/learn/blob/master/app/model...

Feedback and pull requests are of course welcome :)