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.
Bullzip PDF Printer - Free PDF Printer - Create PDF documents from Windows applications. Supports Citrix, Terminal Server, Windows 8, Windows Server 2012, Windows 7, Vista, 2008R2, 2008, 2003, and 2000. Works with 32 and 64 bit systems.
Icecream Apps PDF Editor - Excellent powerful tool to edit PDF, annotate PDF, redact, protect and more.
Atril - Atril is a simple multi-page document viewer. Atril is a fork of Evince.
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.
Ghostscript - Documentation.