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Just reader this: SumatraPDF. It's very fast.
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CodeRabbit
CodeRabbit: AI Code Reviews for Developers. Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR.
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Not sure how good it is for privacy, but it is opensource and I use it a lot - PDFSam https://pdfsam.org/
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Or pdftk. Or Okular. There are many FLOSS options besides using the last free version of some random paid editor.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.