The best open source alternative to SumatraPDF is Okular. If that doesn't suit you, our users have ranked more than 100 alternatives to SumatraPDF and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to SumatraPDF are Evince, MuPDF, Librera Reader and Koodo Reader.
Multi-platform document viewer supporting PDF, ePub, comics, images, and Markdown with annotation, digital signature verification, tabbed interface, sidebar navigation, text selection, text-to-speech, magnifier, search, dark mode, and plugin support.
Supports viewing and editing PDF annotations, displays multiple formats such as PDF, Postscript, DjVu, comic books, TIFF, DVI, XPS, remembers per-document zoom and position, features search, table-of-contents navigation, SyncTeX integration, and printing.
MuPDF offers a highly versatile PDF, XPS, and eBook interpreter, customizable as a renderer, viewer, or toolkit. Features include digital signatures, redactions, form filling, annotations, and page manipulation, ideal for mobile, eBooks, and embedded apps supporting Java, C++, and Python.
Librera Reader is a highly customizable and feature-rich application for reading books in PDF, EPUB, MOBI, DjVu, FB2, TXT, RTF, AZW, AZW3, HTML, CBZ, CBR formats on Android devices.
Koodo Reader is a powerful ebook reader designed to provide a simple and easy-to-use reading experience.
PDF Viewer (aka pdf.js) is a new revolutionary extension using web standard technologies that allows you to display within Mozilla Firefox almost all PDF files found on the web without a plugin.
Openlib is an open source app to download and read books from shadow library (Anna’s Archive). The App Has Built In Reader to Read Books.
Sioyek is a PDF viewer with minimal interface optimized for reading research papers and technical books.
Discover uRead, your ultimate companion for reading and listening! Whether you’re a casual reader or a book enthusiast, uRead transforms your experience with advanced features and a user-friendly design.
Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions.
A document viewer for the GNOME desktop. You can view, search or annotate documents in many different formats.
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Because both programs are design to see documents.