Manuskript - Open-source tool for writers.

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

FocusWriter - FocusWriter is a fullscreen, distraction-free word processor designed to immerse you as much as...

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

Byword - The easy way to write Markdown and rich text on your Mac and iDevices

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.