Dabble Writer - Writing software for novelists.

Fantasia Archive - Free offline worldbuilding and story creation tool with dozens of templates, complex tagging options, document linking, and project-wide search. Template examples: characters, places, events, religions, currencies, magic, species, languages.

Scritika - Scritika is advanced-level writing software that helps the writer to tell their stories in a creative and smart way, and it encourages you to compose the stories quickly.

World Scribe - World Scribe is a platform that eases the creation process if novel and allows users to keep track of important elements in their world.

SmartEdit Writer - Plan, write and edit your novel scene by scene

Obsidian.md - A second brain, for you, forever. Obsidian is a powerful knowledge base that works on top of a local folder of plain text Markdown files.