yesno.wtf - Decision making made easy backed with a suitable GIF
Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.
Decisionize - Simplify decision making in 3 easy steps
Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.
Filament - Easily install any apps to your website!
Poll Everywhere - Audience response system that uses mobile phones, twitter, and the web. Responses are displayed in real-time on gorgeous charts in PowerPoint, Keynote, or web browser.