I am a big fan of quizzes. We use them on our website mainly as a personal product finder. But there are many more applications, depending on your content type:
-What's your perfect coffee bean?
-What should be your next career move?
-What kind of cyclist are you?
-What sights should you visit in London?
Quizzes are engaging and the best thing is that you can ask people for their email address at the end. We don't force them to, so we always offer a Skip button as it can be very annoying to some people.
My favorite quiz makers are:
-Involve.me
-Interact
-Thrive
What's your experience with quizzes, both as a user and email marketer?