The best open source alternative to Okular is SumatraPDF. If that doesn't suit you, our users have ranked more than 100 alternatives to Okular and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Okular are Evince, LibreOffice - Draw, MuPDF and KOReader.
This free, open-source viewer for Windows supports multiple formats like PDF, eBooks (ePub, Mobi), CHM, and Comic Books (CBZ, CBR). Prioritizing simplicity and speed, it offers a lightweight, portable design with a minimalist interface, catering to users seeking fast and efficient document viewing.
Ugly UI, logo and icon. It's nice with FOSS, but I'll go with Okular.
Tabs! and is also open source
Evince (or GNOME Document Viewer) is a document viewer for multiple document formats: PDF, Postscript, djvu, tiff, dvi, XPS, SyncTex support with gedit, comics books (cbr,cbz,cb7 and cbt) and others. See Supported Document Formats for details.
Gnome's project supplies no link of a Windows version.
There is windows compatible version this program.
Draw lets you produce anything from a quick sketch to a complex plan, and gives you the means to communicate with graphics and diagrams. With a maximum page size of 300cm by 300cm, Draw is a an excellent package for producing technical drawings, general posters, and much else.
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.
MuPdf is very minimal, it just opens the file picker. It does not maintain a recent file history or save page history effectively. In long pdfs/ebooks, when you jump to a page and then press back to exit it, instead of exiting the app takes you to front-page and then exits, effectively nullifying any page saving capabilities.
An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Kindle, Kobo, PocketBook, Linux and Android devices.
okular on android is pretty minimal. KOReader provides extensive set of features including favourite files, dark mode, page history etc.
Koodo Reader is an all-in-one e-book reader that can help you better manage and study your e-books. It's free and open-source.
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.
It works well and it works in Firefox
Sioyek is a PDF viewer with minimal interface optimized for reading research papers and technical books.
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...
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.
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Sumatra doesn't have comments and fill forms functionality as Okular does.