Ninja forms - Ninja Forms is a free form creation solution for WordPress.
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!
Google Forms - Simple web forms from Google.
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.
Microsoft Forms - Simplistic surveys by Microsoft.
AidaForm - AidaForm is a cloud-based service to create customizable web forms, landing pages, surveys, polls.