Apple App Analytics - Apple's very own iTunes Connect App Analytics
Survey Monkey - Create and publish online surveys in minutes, and view results graphically and in real time. SurveyMonkey provides free online questionnaire and survey software.
Poltio - Create and share questions, get answers.
Google Forms - Simple web forms from Google.
My Motiff - Allowing you to stay connected in realtime
Zoho Survey - Capture feedback and turn it into actionable insight.