Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
Write or Die - Write or Die is an application for Windows, Mac and Linux which aims to eliminate writer's...
Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers
Dimer Beta - Simplest way to write and publish beautiful docs
Dedalus - Dedalus is an authoring system for generating Choose Your Own Adventure (CYOA) narrative.
WriterStat - WriterStat is an author and novel writing software that helps published authors write more books faster and more consistently.