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 - [![Open-Source Software][OSS Icon]](https://launchpad.net/qpdfview) [qpdf](https://launchpad.net/qpdfview) - qpdfview is a tabbed document viewer.
 - [![Open-Source Software][OSS Icon]](https://github.com/Sigil-Ebook/Sigil) [Sigil](https://github.com/Sigil-Ebook/Sigil) - Sigil is a multi-platform EPUB ebook editor.
 - [![Open-Source Software][OSS Icon]](https://git.pwmt.org/pwmt/zathura.git) [Zathura](https://pwmt.org/projects/zathura/) - Zathura is a highly customizable and functional document viewer.
+- [PDF Studio](https://www.qoppa.com/pdfstudio/) - An easy to use, full-featured PDF editing software that is a reliable alternative to Adobe Acrobat and provides all PDF functions needed at a fraction of the cost. PDF Studio maintains full compatibility with the PDF Standard.
 
 ### Editors
 - [![Open-Source Software][OSS Icon]](https://github.com/atom/atom) [Atom](https://atom.io/) - Hackable text editor for the 21st century.