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PDFTK Builder - PDFTK Builder is a free graphical interface to for PDFTK, making it much easier to use.
PDF24 PDF Creator - Create PDF and convert documents to PDF for free with the free PDF24 PDF Creator.
PDFTools by SheelApps - PDFTools
iSafePDF - iSafePDF is a free open source PDF protection software.
QPDF - QPDF is a command-line program that does structural, content-preserving transformations on PDF...
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.