SurveyJS - Feature rich and open source surveys for embedding into websites.
Invision - Prototyping and collaboration for design teams
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.
Red Pen - Red Pen lets you upload your design, share a short URL, and get live, annotated feedback super-fast.
LimeSurvey - LimeSurvey: the Online-Umfrage Tool - Open-Source Suryeys
Pastel - Sticky note-based feedback collection tool for live websites