kindling

Free, open-source fiction writing software. Your outline stays visible while you draft. Import from Scrivener, Plottr, yWriter, or Obsidian. macOS, Windows & Linux. Maintained by smith-and-web on GitHub, where it has earned 55 stars from the community.

It's actively developed around creative-writing, desktop-application, novel-writing, and is a solid reference for anyone building with these tools.