Cast Your Vote - Cast Your Vote is an app that allows you to set polls and a voting system and know the answer to your question.

Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.

My Vote - My vote is an app that allows you to create ranking, ratings, polling contests, and view the results either after voting closes or in real-time.

Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.

Pollie - Create polls and share them via your favourite tools

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.