Open-Source Objective-C PDF Software

1 open-source PDF tool written in Objective-C.

Skim

Open-source (BSD) macOS PDF reader and note-taker for reading and annotating scientific papers: adding/editing notes and highlights (with one-swipe highlighting), exporting notes as text, TOC/thumbnail navigation with visual history, full-screen presentation mode with transitions, snapshots, bookmarks, Spotlight search, LaTeX/SyncTeX/PDFSync integration, BibDesk compatibility, Keychain-saved passwords, and extensive AppleScript support.