1 Free and Open-source Pdf viewer Apps for macOS (Intel and Apple Silicon)

1- Skim

skimPDF reader and note-taking solution

Skim is a PDF reader and note-taker for macOS (10.7 and later). It's feature-rich program and very useful for researchers as it include notes, highlighting, bookmarks, editing tools and LaTeX support.

Read about Skim 's features, license, platforms, and more.