Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
Ultimate PDF Converter - Ultimate PDF Converter is a great application for those who widely use PDF-documents and have a...
PDFZen - The powerful, simple, free online PDF editor for the masses; free yourself from the fax machine!
Evince - Evince is a document viewer for multiple document formats: PDF, Postscript, djvu, tiff, dvi, XPS...
Xodo - Try easy-to-use PDF tools that keep your documents safe. Work with your important files across all platforms and devices with the ultimate all-in-one document solution. Your productivity lives at Xodo!
Atril - Atril is a simple multi-page document viewer. Atril is a fork of Evince.