1. PDF Expert lets you read and annotate PDF documents, highlight text, make notes and save these changes being compatible with Preview and Adobe Acrobat. Moreover, PDF Expert is the only iPhone application that can fill PDF forms!
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  2. Skim is a PDF reader and note-taker for OS X. It is designed to help you read and annotate scientific papers in PDF, but is also great for viewing any PDF file.


  3. zathura is a highly customizable and functional PDF viewer based on the poppler rendering library and the gtk+ toolkit.
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  4. One eBook reader for all your Adobe DRM protected books across your iPad, Mac or PC. Adobe Digital Editions (ADE) is free-to-download and use, and completely ad-free. Use it to read EPUB and PDF books, both online and offline.
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    • FreeOpen Source
    • Linux
    • Android
    • Kobo
    • PocketBook Reader
    • Ubuntu Touch
    • Amazon Kindle
    KOReader is a document viewer for E Ink devices. Supported fileformats include EPUB, PDF, DjVu, XPS, CBT, CBZ, FB2, PDB, TXT, HTML, RTF, CHM, DOC, MOBI and ZIP files. It’s available for Kindle, Kobo, PocketBook, Android and desktop Linux.
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  5. Nitro Reader offers features and functionality far beyond typical PDF readers, and makes working with PDF easier than ever before. Create PDF files, comment and review, save PDF forms, extract text and images, type text directly onto the page, and more.
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  6. Excellent powerful tool to edit PDF, annotate PDF, redact, protect and more. PRO Version includes: Remove default watermark Combine PDF files Lifetime license - Windows Commercial use Priority Support.
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  7. PDF Reader is the ideal app for anyone who works with PDFs in the office or at home. PDF Reader allows you to organize all annotated information with a few taps.
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  8. Full-featured solution to view, create, edit, comment, collaborate online, secure, organize, export, OCR, and sign PDF documents and forms. Now available with ConnectedPDF technology.
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  9. qpdfview is a Qt-based tabbed document viewer using the Poppler library for PDF rendering and CUPS for printing. Support for the DjVu and PostScript formats can be added via plugins.
  10. With GoodReader on your iPhone, iPod Touch or iPad, you can read virtually anything, anywhere. Books, movies, maps, pictures; GoodReader puts it all in a single app, right in your pocket.
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  11. v1.1.0 - PDF file association. - New PDF file icons. v1.0.0 - First release. - Tabbed View to easily switch between multiple documents. - Document Navigation Tools. - Thumbnail and Outline Panes. - Find, Go to, Zoom and Print.
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  12. In version 8, Google Chrome introduced a free PDF viewer, installed by default. While this plug-in lacks many features of the Adobe Acrobat Plug-in, it is much faster and lighter, and updates with the browser rather than an external utility.
  13. Calibre Web is a web app providing a clean interface for browsing, reading and downloading eBooks using an existing Calibre database.