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MuPDF - MuPDF is a lightweight PDF and XPS viewer.
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.
Okular - Okular is a universal document viewer based developed by KDE.
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.
qpdfview - qpdfview is a Qt-based tabbed document viewer using the Poppler library for PDF rendering and CUPS...
Icecream Apps PDF Editor - Excellent powerful tool to edit PDF, annotate PDF, redact, protect and more.