SurveySwap - Find survey participants for free. help each other by taking each other's surveys.

Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.

SurveyCircle - SurveyCircle is the world’s largest community for mutual support in online research – helping students, PhD candidates, researchers, founders, and startups to find survey participants for research studies and market research surveys.

Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.

Pollfish - Pollfish's mobile survey platform provides today's professionals with deep insights from real consumers leading to better business decisions. Create your first survey in minutes.

Poll Everywhere - Audience response system that uses mobile phones, twitter, and the web. Responses are displayed in real-time on gorgeous charts in PowerPoint, Keynote, or web browser.