Foxit Reader is a lightweight, fast PDF Reader.

Mendeley is a free reference manager and an academic social network.

Xournal is an application for notetaking, sketching, keeping a journal using a stylus.

Filestage is the easiest way to share, review and approve media content with your clients and co-workers. Client review for video, audio, design and documents…

Evince is a document viewer for PDF, PostScript, DjVu, TIFF, XPS and DVI formats.

Okular is a universal document viewer based developed by KDE.

qpdfview is a tabbed document viewer.