Zendesk - Zendesk is a beautiful, lightweight help-desk solution.

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

Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community

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

HelpScout - Help Scout is a simple, straightforward way to provide excellent support

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.