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Okular - Okular is a universal document viewer based developed by KDE.
MuPDF - MuPDF is a lightweight PDF and XPS viewer.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
qpdfview - qpdfview is a Qt-based tabbed document viewer using the Poppler library for PDF rendering and CUPS...
Atril - Atril is a simple multi-page document viewer. Atril is a fork of Evince.