Okular - Okular is a universal document viewer based developed by KDE.
Apowersoft PDF Converter - Apowersoft PDF Converter is a safe and stable PDF converter, which can quickly convert PDF to Word, PPT, Excel, JPG, PNG and many more formats.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
Wide Angle PDF Converter - Convert PDF documents to Word, PowerPoint, Excel, JPG and other formats!
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
PDFManagerUltimate - Read, edit, and convert PDF files.