Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.
Interactive NPS Calculator (by Delighted) - Calculate your NPS easily with this interactive free tool.
Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.
TinyNPS - Simple NPS feedback
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.
Delighted + NomNom Integration - Turn your NPS responses into product insights