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.
Invision - Prototyping and collaboration for design teams
Google Forms - Simple web forms from Google.
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