LibreOffice - Writer - Open-source cross-platform word processor.
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Microsoft Word - Microsoft Word is a commercial word document processor for Windows.
DocxManager - DocxManager is an elegant tool for writers that are requiring any management work for the word.
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.
NovaScriber - A most awesome tool to write novels