Greetings,

What is the criteria for compiling the table?

The reason I ask is because for OS X, the following are all available via package managers such as MacPorts, even though the table indicates they are not:

ePDFView
https://trac.macports.org/browser/trunk/dports/print/epdfview/Portfile

Evince
https://trac.macports.org/browser/trunk/dports/gnome/evince/Portfile

MuPDF
https://trac.macports.org/browser/trunk/dports/graphics/mupdf/Portfile

GhostScript
https://trac.macports.org/browser/trunk/dports/print/ghostscript/Portfile

And for the ones alaready on the list:

gv
https://trac.macports.org/browser/trunk/dports/print/gv/Portfile

Okular
https://trac.macports.org/browser/trunk/dports/kde/okular/Portfile

xpdf
https://trac.macports.org/browser/trunk/dports/graphics/xpdf/Portfile

Lastly, this is a popular tool, but it may be BSD rather than GPL licensed:

Skim
http://skim-app.sourceforge.net

Art