
by KDE
KDE's universal document viewer with PDF annotation.

Okular views PDF, EPUB, comics and many other formats, with annotations, form filling and digital signature support.

Adobe's PDF viewer and editor.

Self-hosted web app for merging, splitting, converting and editing PDFs.
Yes. Okular can be used for free (pricing: Free).
Okular is available on Windows and Linux.
Yes. Okular is open source under the GNU GPL v2 or later license.
Okular is developed by KDE.
The top-ranked alternatives to Okular are Adobe Acrobat and Stirling-PDF.
Okular is listed under PDF Tools. KDE's universal document viewer with PDF annotation.
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