Apple App Analytics - Apple's very own iTunes Connect App Analytics
FreeSurveyCreator - With free survey creator you can embed a survey in your site and start receiving visitor feedback in no time. It is free and easy to setup
Poltio - Create and share questions, get answers.
Wedgies - Realtime polling over social media
My Motiff - Allowing you to stay connected in realtime
Typeform - Create beautiful, next-generation online forms with Typeform, the form & survey builder that makes asking questions easy & human on any device. Try it FREE!