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 - [![Open-Source Software][OSS Icon]](http://git.ghostscript.com/?p=mupdf.git;a=summary) [MuPDF](https://mupdf.com/) - a lightweight PDF and XPS viewer.
 - [![Open-Source Software][OSS Icon]](https://github.com/KDE/okular) [Okular](https://okular.kde.org/) - Okular is a universal document viewer based developed by KDE. Okular works on multiple platforms, including but not limited to Linux, Windows, Mac OS X, BSD, etc.
 - [![Open-Source Software][OSS Icon]](https://github.com/torakiki/pdfsam) [PDFsam](http://www.pdfsam.org/) - A desktop application to split, extract pages, rotate, mix and merge PDF files.
+- [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.
 - [![Open-Source Software][OSS Icon]](https://github.com/burtonator/polar-bookshelf) [Polar](https://getpolarized.io/) - Polar is a personal knowledge repository for PDF and web content supporting incremental reading and document annotation.
 - [![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.