Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
1World Online - 1World's Platform consists of applications like polls, quizzes, surveys, and debates to boost engagement and revenue opportunities.
Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers
Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.
Yarn Spinner - Tool for creating interactive dialogue and games in Unity.
doopoll - Create live, instant, editable polls effortlessly