Apple App Analytics - Apple's very own iTunes Connect App Analytics
Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.
My Motiff - Allowing you to stay connected in realtime
Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.
Usage Analytics in appFigures - Track usage for your app along side downloads, ranks & more
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.