Manuskript - Open-source tool for writers.
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Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
DocxManager - DocxManager is an elegant tool for writers that are requiring any management work for the word.
RenPy - Ren'Py is a free and cross-platform visual novel engine that helps you use words, pictures, and...
Story Architect (STARC) - STARC - A smooth yet powerful screenwriting experience for devoted authors. With only wanted features and simple workflow it runs faster than all your previous apps combined.