PDFtk - PDFtk is a simple tool for doing everyday things with PDF documents.
PDF24 PDF Creator - Create PDF and convert documents to PDF for free with the free PDF24 PDF Creator.
AutoMetadata - AutoMetadata is a tool for exploring and manipulating metadata, document properties, and viewer preferences in multiple PDF documents.
iSafePDF - iSafePDF is a free open source PDF protection software.
Pdfinfo - Pdfinfo is a PDF document information and metadata extractor tool.
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.