PDFpen - PDFpen is a PDF editor to add text, images, and signatures to PDFs.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
CutePDF - CutePDF is a simple but entirely powerful PDF files creator, converter, and virtual printer.
MuPDF - MuPDF is a lightweight PDF and XPS viewer.