StoryMill - Developers and publishers of Mac, Win, and iOS productivity, home and office and writing software such as MacGourmet, Paperless and many more. Based in MN.
Twine - Twine is an open-source tool for telling interactive, nonlinear stories.
Novelize - Novelize is an online novel writing app designed to keep authors on track.
RenPy - Ren'Py is a free and cross-platform visual novel engine that helps you use words, pictures, and...
Manuskript - Open-source tool for writers.
Quest - Quest lets you create sophisticated text-based games, without having to program.