Okular is a universal document viewer developed by KDE that supports PDF, PS, TIFF, DjVu, ePub, comic books, and many other formats. It offers a sidebar with contents, thumbnails, reviews and bookmarks, plus full annotation support. It runs on multiple platforms including Linux, Windows, and macOS and is distributed as free open source software.
In the Read-it-later & curation space, Okular takes a focused approach. Viewing, annotating, and navigating a wide variety of document formats in one application. Okular is an open-source project aimed at students, researchers and general computer users. The product is available for free. Okular is available on Linux.
Behind Okular is KDE. Among its 5 catalogued features are Multi-format Support, annotations, and bookmarks.
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Other apps tracked under the same category.