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.
Boolean - Send single question yes/no surveys
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!
Surveys in Slack by Polly - The world's first fully immersive Slack-based survey product
Google Forms - Simple web forms from Google.
Simple Poll - The easiest way to create polls in Slack