Okular - Okular is a universal document viewer based developed by KDE.
RadaeePDF - RadaeePDF is a library for developers who want to render, manipulate, annotate PDF files on Android, iOS and Windows.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
SignRequest for G Suite - Sign yourself or get documents signed Easy, secure, legally binding and free. SignRequest helps you sign online.
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.