Software Finder

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Adobe Acrobat Reader
Android, Blackberry, iOS, Mac OS, Windows, Windows App | Alternatives

The mobile version is lighter for reliably viewing, annotating and signing PDFs

 pdf-reader, pdf-viewer, ebook-reader    Office & Productivity, PDF Reader    Free
Editor Rating:
4.5
PDF-XChange Editor
Windows | Alternatives

It serves as a PDF viewer plus basic editing requirements

 pdf-reader, pdf-editor, pdf-tool    Office & Productivity, PDF Reader    Free (Limited features)
Editor Rating:
5
Foxit Reader
Android, iOS, Windows, Windows App | Alternatives

A worthy contender to open and accurately render pdf files

 pdf-reader, pdf-editor, pdf-tool    Office & Productivity, PDF Reader    Free
Editor Rating:
4
Sumatra PDF
Windows | Alternatives

A simple and light pdf reader

 pdf-reader, pdf-editor, pdf-tool    Office & Productivity, PDF Reader    Free (Open source)
Editor Rating:
3
Foxit MobilePDF
Android, iOS, Windows App | Alternatives

Provides a good PDF reading experience thanks to its complete suite of tools

 pdf-reader, pdf-viewer, ebook-reader    Office & Productivity, PDF Reader    Free
Editor Rating:
4
SmartQ Reader
Android | Alternatives

A very capable PDF reader packs a complete set of notation tools that work great on mobiles

 pdf-reader, pdf-viewer, ebook-reader    Office & Productivity, PDF Reader    Free
Editor Rating:
4
MuPDF
Android, iOS, Linux, Windows, Windows App | Alternatives

A very fast and reliable PDF viewer supports not only PDFs, but also XPS, Open XPS and CBZ files

 pdf-reader, pdf-viewer, ebook-reader    Office & Productivity, PDF Reader    Free (Open source)
Editor Rating:
4
AnDoc - PDF & DJVU Reader
Android | Alternatives

A very good app provides a good PDF reading experience even on low-spec devices

 pdf-reader, pdf-viewer, ebook-reader    Office & Productivity, PDF Reader    Free
Editor Rating:
3
FileApp
iOS

Copy Files for Reading and Playing on your iPad or iPhone

 file-manager, document-reader, file-viewer, file-reader, app-of-the-week    Disk & File, File Manager, Office & Productivity, PDF Reader    Free (Limited features)
Editor Rating:
4.5