Manuskript is an open-source tool for writers, with outliner, character management, plot development, distraction-free editor, etc.
Focus on your words not the interface.
Quoll Writer is a writing application that helps you focus on your words.
Clean and uncluttered.
Features are where you would expect them to be.
A visual story plotting tool that makes it simple to plan out your next novel. Drag and drop scenes, and plot lines. Keep all your notes in one place. It helps you to organize, simplify, and have more time for writing!.
Online story-writing platform. Free for offline use. Only $30/year for full features. Organize your stories, track characters and locations. Groundbreaking plot interface.
A community for collaborative character creation and trading, worldbuilding and roleplay. Toyhouse is invite-only and only premium users can give out invites.
The Aurora Builder is a free tool that lets you create characters for your dungeons and dragons game using the bundled content, your own content, and content created by others.