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PDF editor with ability to browse/edit the tree of raw pdf objects

Convert your documents

Yet another comic reader

Tricks for PDF Files

Edit PDF document metadata

Productive PDF Software That You'll Love to Use

An application to perform common editing operations on PDF files

Manage and optimize PDF files

Simple tool to rearrange, merge, delete and rotate pages in PDF files

PDF viewer designed for reading research papers and technical books

Redact PDF documents

Graphical interface for the PDF Toolkit (PDFtk)

PDF Maker

Simple application that joins multiple PDF files together

Crop PDF files

veraPDF is a file-format validator for the PDF/A archiving standard

Modify PDF sewing patterns

HTML Conversion Software

iText RUPS is a tool to view PDF structure