Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
genei.io - AI-generated summaries for any article or research paper.
calibre - Ebook manager, viewer & converter
Lumin PDF - Lumin is a fast, easy-to-use, and secure PDF viewer, editor, and sharer that lets you view and fill in PDF forms.
Okular - Okular is a universal document viewer based developed by KDE.
Kofax Power PDF - Until now, you’ve been forced to compromise when it comes to PDF software.