FreeWriter is described as 'fully featured writing software suite to assist in writing novels and reports' and is a Novel Authoring App in the Office & Productivity category. There are more than 25 alternatives to FreeWriter for a variety of platforms, including Windows, Mac, Online / Web-based, Linux and iPad. The best alternative is Manuskript, which is both free and Open Source. Other great apps like FreeWriter are Scrivener (Paid), Hemingway Editor (Paid), bibisco (Freemium, Open Source) and Gingko (Freemium).
Manuskript is an open-source tool for writers, with outliner, character management, plot development, distraction-free editor, etc. Outliner Organize your thoughts and snippets in a hierarchical manner. Organize them as you wish, reorganize them on the go.
Write and organize your ideas in Gingko tree documents. Whether building a business or writing a bestseller, Gingko lets your ideas flow naturally into place. Write, brainstorm, and organize your document, all in the same flow.
yWriter is a writing tool that uses "scenes" as a unit of text and allows you to associate that text with all manner of story elements (characters, locations, items) as well as place it and rearrange it within the context of chapters.
Looking for a suite of tools for writing your book? This is not just a text editor it does so much more. Organise your story using timelines, planning boards and the snowflake tool, all integrated to make writing intuitive and fun.