Quizzes for Pages - Quizzes for Pages is an application to create and share quizzes on your Facebook Page.
Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.
Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers
doopoll - Create live, instant, editable polls effortlessly
Quest - Quest lets you create sophisticated text-based games, without having to program.