Okular is described as 'Multi-platform document viewer supporting PDF, comics, EPUB, images, and Markdown with annotation tools, sidebar navigation, and text-to-speech features' and is a very popular PDF Reader in the office & productivity category. There are more than 100 alternatives to Okular for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Okular alternative is SumatraPDF, which is both free and Open Source. Other great apps like Okular are Foxit PDF Reader, Evince, LibreOffice - Draw and MuPDF.
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.
Read book files in EPUB, PDF, DOC, DOCX, RTF, TXT, DJVU, FB2, MOBI and CHM formats. Supports chapters, bookmarks, page style. Saves the current reading position. Automatic detection and display of the list of all supported documents on your device.
Sioyek is a PDF viewer with minimal interface optimized for reading research papers and technical books.
Customizable reader for EPUB, MOBI, AZW, PDF, FB2, and TXT, offering text-to-speech, bookmarks, highlighting, notes, adjustable fonts, color themes, intuitive interface, quick annotations, search, theme customization, and background image support.
Lightning fast with a slick design, Kavita is a rocket-fueled self-hosted digital library which supports a vast array of file formats. Install to start reading and share your server with your friends. book reader, self hosted, manga, comics, free, manhwa, e readers, electronic...
Native macOS app for viewing, annotating, and editing images and PDFs, featuring tools for cropping, rotating, resizing images, rearranging pages, full-screen viewing, markup, document merging, batch conversion, and export in multiple formats.
Create, Convert, Review and Edit PDF Documents on Windows, macOS, and Linux.
Xodo is the ultimate cross-platform PDF viewer and annotator. Powerful, fast, and optimized for all phones and tablets, Xodo makes it easy to access, edit, share, sync, manage, sign, and more.
Best annotation toolbox I know for android
perfect program than others
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.
Read, annotate, and highlight PDFs, fill interactive forms with saved input, underline or strike through text, manage bookmarks, sync files from cloud services, and share documents. Compatible with Preview and Adobe Acrobat annotations, supporting extensive iOS features.
A document viewer for the GNOME desktop. You can view, search or annotate documents in many different formats.
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It works well and it works in Firefox