jPDFFields allows your application to get and set field values.
iTextPDF - iText offers flexible tools for PDF creation, editing and inspection.
Microsoft Word - Microsoft Word is a commercial word document processor for Windows.
iText - iText is an intuitive and refined text editor with word processing completely rewritten in Cocoa...
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 Master SDK - RadaeePDF SDK is a powerful PDF rendering library for Android iOS and Windows 8/8.1, WindowsPhone and Windows 10 UWP. RadaeePDF SDK can render, create, annotate, modify PDF files. RadaeePDF SDK can get and set PDF form and acroform.
AbiWord - AbiWord is a free software word processor.