LibreOffice - Writer - Open-source cross-platform word processor.

iA Writer - Minimal Design, Maximum Focus

Microsoft Word - Microsoft Word is a commercial word document processor for Windows.

Atlantis Word Processor - Atlantis Word Processor enables users to create documents and reports and to publish e-books.

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.

OmmWriter - Ommwriter is a simple text processor that firmly believes in making writing a pleasure once again, reinvindicating the close relationship between writer and paper.