Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
Dimer Beta - Simplest way to write and publish beautiful docs
Ink by Inkle - ink is a popular open source scripting language for branching stories, designed for writers
Write or Die - Write or Die is an application for Windows, Mac and Linux which aims to eliminate writer's...
Quest - Quest lets you create sophisticated text-based games, without having to program.
WordKeeperAlpha - WordKeeperAlpha is a writing tool designed to motivate you to write and track your progress.