LibreOffice - Writer - Open-source cross-platform word processor.
Word Online - Word Online, part of Office Online, is the online version of Microsoft Word.
Microsoft Word - Microsoft Word is a commercial word document processor for Windows.
JotterPad - JotterPad Writer for Android — Turn your thoughts into text. Go about your creative writing without distractions, write to your hearts content...
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.
Pure Writer - fast, smooth, fluid, at any time, never lose content, Markdown, super reliable