======Apple - Applications - PDF======

[[https://skim-app.sourceforge.io|SourceForge - Skim]]. Found via [[https://apple.stackexchange.com/questions/72875/open-two-views-of-the-same-pdf|Ask Different - Open two views of the same PDF]], and [[https://superuser.com/questions/794877/how-do-i-read-a-pdf-in-2-simultaneous-views-split-view-mac|Ask Different - How do I read a PDF in 2 simultaneous views (split view) / Mac]].