LibreOffice - Writer - Open-source cross-platform word processor.
Kdan PDF Reader - The All-in-One Document Expert Designed for the Increasingly-mobile Workplace.
Microsoft Word - Microsoft Word is a commercial word document processor for Windows.
Qoppa Software - Qoppa Software offers a suite of products that cover every aspect of PDF processes and integrate seamlessly into document workflows.
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.
RadaeePDF - RadaeePDF is a library for developers who want to render, manipulate, annotate PDF files on Android, iOS and Windows.