Artifex Software

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MuPDF for Linux
Free
Allow you to view PDF documents with parser or rendering library.
Linux
AFPL Ghostscript
Free
Comprehensive Overview of AFPL Ghostscript for Mac
Mac
MuPDF
Free
MuPDF: Versatile Animation Software for Windows
Windows
SmartOffice - View & Edit MS Office files & PDFs
Free
Comprehensive Office Suite for Android Devices
Android