docassemble - docassemble is a free, open-source expert system for guided interviews and document assembly.
ApowerPDF - ApowerPDF is a versatile PDF editor which also features as PDF converter, viewer, creator and more. It provides a perfect solution for all users.
HotDocs - Template-driven, automated document & form assembly software
Icecream Apps PDF Editor - Excellent powerful tool to edit PDF, annotate PDF, redact, protect and more.
XpressDox - XpressDox Desktop for Microsoft® Office Word is an affordable document assembly system.
PDF Reader Pro - PDF Reader Pro is an all-in-one PDF office supporting to Read, Annotate, Edit, OCR, Convert, Create & Fill Form, Sign PDFs, TTS on Mac, iOS, Android, and Windows.