Communifire - Enterprise Social Collaboration Software
Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
DigitalChalk - Online Training Software and Learning Management System (LMS)
Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers
Workplace by Facebook - Connect everyone in your company and turn ideas into action.
Quest - Quest lets you create sophisticated text-based games, without having to program.