PDFedit - Free (and open source) editor for manipulating PDF documents. GUI version + commandline interface.
PDF24 PDF Creator - Create PDF and convert documents to PDF for free with the free PDF24 PDF Creator.
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 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.
Master PDF Editor - Master PDF Editor is complete solution for editing PDF and XPS files.
PortableSigner - PortableSigner is a signing (with X.509 certificates) program for PDF files.