Acquainted - A simple tool to create conversational polls and surveys
Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.
Expose - A beautiful, open-source, tunneling service - written in PHP
Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.
Init.ai - Init.ai is the simplest way to build, train, and deploy intelligent conversational apps
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.