PDFpen - PDFpen is a PDF editor to add text, images, and signatures to PDFs.
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.
Adobe Reader - Adobe Acrobat Reader is a free tool for viewing documents that have been stored in Adobe's Portable Document Format (PDF).
PDF-XChange Editor - The smallest, fastest, most feature-rich PDF editor/viewer available
Foxit PhantomPDF - Edit PDF files with our feature-rich PDF Editor. Download Foxit PDF Editor to convert, sign, scan / OCR & more. A speedy PDF Editor alternative to Adobe Acrobat.
CutePDF - CutePDF is a simple but entirely powerful PDF files creator, converter, and virtual printer.