docassemble - docassemble is a free, open-source expert system for guided interviews and document assembly.
Wondershare PDFelement - All-in-one PDF editor
HotDocs - Template-driven, automated document & form assembly software
Foxit PhantomPDF - Edit PDF files with our feature-rich PDF Editor. Download Foxit PDF Editor to convert, sign, scan / OCR & more. A speedy PDF Editor alternative to Adobe Acrobat.
XpressDox - XpressDox Desktop for Microsoft® Office Word is an affordable document assembly system.
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.