Plot Factory - Online story planner, organizer, and writing application.
Dabble Writer - Writing software for novelists.
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
SHAXPIR - A modern cloud workspace for fiction writing & worldbuilding
World Anvil - World Anvil is a worldbuilding tool for Authors, Storytellers and worldbuilding lovers.
Manuskript - Open-source tool for writers.