Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Plot Factory - Online story planner, organizer, and writing application.
Manuskript - Open-source tool for writers.
World Anvil - World Anvil is a worldbuilding tool for Authors, Storytellers and worldbuilding lovers.
Final Draft - Use your creative energy to focus on the content; let Final Draft take care of the style.
Dabble Writer - Writing software for novelists.