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.
UserVoice - UserVoice integrates easy-to-use feedback, helpdesk, and knowledge base management tools in one platform that empowers users to speak and companies to understand.
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!
FEEDBACKdeck - FEEDBACKdeck brings to WordPress, a gorgeous way to capture user feedback.
LimeSurvey - LimeSurvey: the Online-Umfrage Tool - Open-Source Suryeys
Survicate - Collect feedback on your website and find out more about your visitors.