YourQuote - YourQuote is an interactive mobile app that helps you to write stories, quotes, screenplays, poems, and books.
Plot Factory - Online story planner, organizer, and writing application.
Pure Writer - fast, smooth, fluid, at any time, never lose content, Markdown, super reliable
World Anvil - World Anvil is a worldbuilding tool for Authors, Storytellers and worldbuilding lovers.
JotterPad - JotterPad Writer for Android — Turn your thoughts into text. Go about your creative writing without distractions, write to your hearts content...
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.