Skim
Open SourceSkim is a free and open-source PDF reader and note-taker for macOS. Tailored for scientific use, it offers advanced annotation tools, robust export options, and tight integration with LaTeX, making it an ideal companion for academic research and professional document management.
Key Features
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Excellent annotation tools for detailed markup.
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Lightweight with good performance on large files.
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Strong integration with LaTeX and BibDesk for academic users.