Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.
UserTesting.com - Usability testing has never been easier. Get videos of real people speaking their thoughts as they use websites, mobile apps, prototypes and more!
Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.
Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.
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.
Userbrain - Easy, fast, and affordable user testing for websites and prototypes.