Okular - Okular is a universal document viewer based developed by KDE.
TeamViewer - TeamViewer lets you establish a connection to any PC or server within just a few seconds.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
AnyDesk - AnyDesk is the world's most comfortable remote desktop application. Access all your programs, documents and files from anywhere, without having to entrust your data to a cloud service.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
join.me - Instant screen sharing. Instant Aha!