It's Memrise-interfacing facebook chat bot!
By using the private memrise API, it can create an account, sign you up for courses, and quiz you on the cards within that course!
It obviously doesn't implement the entire API (and the features the chatbot does support are rather hacked together).
Some interesting files:
If you want to run this yourself, 1) good luck 2) just kidding, it's a normal rails project.
gem install bundler
bundle install
rails db:setup