WikiQuiz is a learning game which creates questions around a topic you specify. It utilises MediaWiki's API to request articles based on a topic, then parses the page and finds facts it can reliably understand, which it then uses to create simple quiz-style questions with multiple-choice answers.
You can view more development files for this (e.g. project files used to export images) at eohomegrownapps/wikiquiznotes.