Linux Softwares to Outline mode

yWriter is a free word processor designed specifically for novelists. It breaks down your manuscript into manageable chapters and scenes, providing tools for tracking characters, locations, items, and plot points, allowing you to focus on the creative process.

Typora is a minimalist Markdown editor that unifies writing and previewing into a seamless experience. It provides a distraction-free environment with real-time rendering, allowing users to focus solely on their content without the need for separate preview panes or modes. It supports a wide range of Markdown features and offers flexible export options.

Org-mode is a powerful and flexible mode for GNU Emacs, designed for note-taking, project planning, to-do list management, and authoring documents. It utilizes simple plain text files with intuitive markup.