Typora - A minimal Markdown reading & writing app.

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

Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber

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.

Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.

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