Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
POKATreader - With POKATreader you can read your PDF files in full-screen mode, but one of the best features is...
PDFZen - The powerful, simple, free online PDF editor for the masses; free yourself from the fax machine!
PDF-XChange Editor - The smallest, fastest, most feature-rich PDF editor/viewer available
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!
BePDF - BePDF is a PDF viewer for the BeOS, Haiku & Zeta.