Simple Poll - The easiest way to create polls in Slack
Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.
iPoll.app - Create instant polls and forms with in slack!
Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.
Twitter Polls - Polls embedded in tweets
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.