I wonder that I didn't find any good quiz engine yet that is open source.

There are games like It's Quiz Time or You Don't Know Jack. There also are some web quiz platforms like Kahoot or MyQuiz that can be used for educational purpose too. The idea is that you get quiz questions on one device and players can vote with their mobile device. Depending on the software, it supports different varieties of questions.

Something like Tux Quiz would be nice, an open source project with community driven questions. What do you think? Does something like this already exist?