FeedbackSpark's answer
Range of powerful features designed specifically for digital product teams:
Back Market - the refurbished (super) market
Simple Poll - The easiest way to create polls in Slack
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.
Twitter Polls - Polls embedded in tweets
Google Forms - Simple web forms from Google.
Polls for WhatsApp - Create & share quick polls in your WhatsApp groups