Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
Do - Do helps you run productive meetings. Do work you love.
Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers
Kurator - The premier Chrome extension for savvy researchers and publishers alike. Curate your interest and publish to your website, newsletter and social media sites directly from the browser.
Quest - Quest lets you create sophisticated text-based games, without having to program.
Vabotu - More than slack. More than Trello. FREE.