Classtools.net is a free flash tool website that allows you to create quizzes, diagrams, and educational games. You can then host them on your own site free of charge.
You can sign up for the premium version of the website if you want access to more tools or ad-free templates.
Create and publish your own online survey or quiz in minutes. You can make 10-question surveys with 100 respondents for free. It's super easy to use and you don't have to download anything.
Is it a game or is it a way to assess students' knowledge? It's both! Gamification provides an element of intrinsic motivation for students to "get it right" and really show their teacher what they know.