PDFTK Builder - PDFTK Builder is a free graphical interface to for PDFTK, making it much easier to use.
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.
PDFTools by SheelApps - PDFTools
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
QPDF - QPDF is a command-line program that does structural, content-preserving transformations on PDF...
Wondershare PDFelement - All-in-one PDF editor