Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
PDF Expert - Download a free trial of PDF Expert - the best PDF software for your Mac. Enjoy advanced reading layouts, powerful PDF editing and classical annotation tools.
Xodo - Try easy-to-use PDF tools that keep your documents safe. Work with your important files across all platforms and devices with the ultimate all-in-one document solution. Your productivity lives at Xodo!
GoodNotes - GoodNotes lets you take notes and annotate PDF documents.
Evince - Evince is a document viewer for multiple document formats: PDF, Postscript, djvu, tiff, dvi, XPS...
Okular - Okular is a universal document viewer based developed by KDE.