Storyist

Storyist is a writing environment for novelists and screenwriters that allows you to write, collaborate with other writers, and publish your work in multiple formats. Storyist is built on top of the Fountain markup language, which means it supports a wide range of files. You can write in Markdown, Fountain, Final Draft, or plain text and automatically convert all those files into a single file that suits your needs. The app also comes with a number of features that make it easy to collaborate with others and work on large-scale projects. You can share links to your document so others can view and edit it, or use Storyist's built-in chat feature to discuss ideas with your co-authors.