Lithomobilus is a free reader app that advertises itself as being for non-linear storytelling:
Lithomobilus is the first e-book platform that augments existing narrative forms and makes entirely new nonlinear narratives, without eliminating the things that make books wonderful. Our online writing software gives authors the power to expand upon their existing works, create new works with built-in expansion opportunities, and craft amazing nonlinear works.
Currently the content includes five issues of the NonBinary Review, one issue of Unbound Octavo and a few standalone stories. NonBinary Review takes existing, public domain work and sets it side by side with response material from current authors; so far these include The King in Yellow, Bulfinch’s Mythology: The Age of Fable, The Wonderful Wizard of Oz, Frankenstein, and Grimm’s Fairy Tales. Unbound Octavo contains three short prose pieces that, as far as I could tell, could have been presented in a standard ebook format with no loss of structure.
Meanwhile, the pitch to readers is as follows:
When you are consumed by a story, you can never get enough. You want more characters, more details, more commentary, more of what makes that book addictive. The Lithomobilus e-book platform delivers it all without taking you away from your book.
Which isn’t that far off from the pitch for the Coliloquy novel I covered last month, but Lithomobilus takes a different approach to the same challenge.