SurveyJS - Feature rich and open source surveys for embedding into websites.
Savahapp - The all-in-one design sharing, collaboration, workflow and app prototyping platform
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.
Conceptzilla - Get competitive design for a fraction of the industry cost
LimeSurvey - LimeSurvey: the Online-Umfrage Tool - Open-Source Suryeys
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.