What are some alternatives?
When comparing Evince and Okular, you can also consider the following products
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.
PDF Reader X - PDF Reader X is a nest in the class PDF reader, PDF annotator and PDF editor for the Mac OS X operating systems.
MuPDF - MuPDF is a lightweight PDF and XPS viewer.
PDF-XChange Viewer - PDF-XChange Viewer is an alternative viewer for PDF files that enables you to view and annotate PDF...
zathura - zathura is a highly customizable and functional PDF viewer based on the poppler rendering library...