Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
PDF Previewer for Windows 8 - Features of PDF Previewer for Windows 8, Windows 8.1 - Preview PDF document with PDF preview handler technique
calibre - Ebook manager, viewer & converter
APV - Open Source PDF Viewer for Android based on MuPDF library
Okular - Okular is a universal document viewer based developed by KDE.
POKATreader - With POKATreader you can read your PDF files in full-screen mode, but one of the best features is...