If you're looking for a novel writing software that can help you flesh out your story and characters, Novelcrafter is a great option. It's a full featured writing environment with a personal Wiki (Codex) for storing story details, different writing modes, and AI tools to help you plan, write and review. The Codex is a central repository for characters, locations, and other details, so you can keep everything in one place as you write.
Another good option is Subtxt, which uses AI to build the narrative structure and consistency of your story. It's got tools like Narrative Agents, Premise Builder, and Storyforms to help you create and edit your story. Subtxt is good for checking for gaps in your narrative and getting a pro's perspective on your work.
If you're struggling with writer's block and need help organizing your project, Sudowrite could be the best option. It uses large language models like GPT-3 and GPT-4 to generate text from prompts, and it's got tools for idea generation, outlining, writing and editing. Sudowrite can help you get your creative juices flowing and stay productive with different modes and project management tools.
Last, LivingWriter has a clean interface for organizing manuscripts with drag-and-drop chapter management and an AI Outline Generator based on famous narrative frameworks. It syncs with the cloud so you can use it on multiple devices, and it's got smart text and auto-suggest tools, too, so it's a good option for novelists.