Evince is adocument viewerfor multipledocumentformats. Thegoal of evinceis to replacethe multipledocumentviewers thatexist on theGNOME Desktopwith a singlesimpleapplication. Evince isspecificallydesigned tosupport thefile followingformats: PDF,Postscript,djvu, tiff,dvi, XPS,SyncTex supportwith gedit,comics books(cbr,cbz,cb7and cbt). For acomprehensivelist of formatssupported, seeSupportedDocumentFormats.
Poppler islibrarified PDFrenderingtoolkit derivedfrom the Xpdf3.0 code base.It can utilizeX11-independentrenderingbackends likeCairo, Splash,or Qt4 Arthur.It's notdesigned forplatform-agnosticy,but properBSD/Linuxintegration; isused by variousPDFapplications(Evince,Okular,TeXStudio,pdftotext,Zathura,Xournal,Inkscape), andcomes with aset ofcommand-linetools of itsown.
FlaxPDF is afast, nicemultithreadedPDF viewer forthe desktop. Aslong as thereare more pagesthan cores,every core willget a workout. Light ondependencies,trimmingborders, andaggressivecaching are itsmajor points.