EUSurvey - EUSurvey is an online survey-management system built for the creation and publishing of globally accessible forms, such as user satisfaction surveys and public consultations.
LimeSurvey - LimeSurvey: the Online-Umfrage Tool - Open-Source Suryeys
Google Forms - Simple web forms from Google.
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!
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.