Open source PDF editor
Cross-platform SDK for creating and modifying PDF documents
A fast DVI, EPS, and PDF to SVG converter
The Ray Tracing in One Weekend series of books
An integrated writing environment for creating LaTeX documents
XML editor
PDF transformation/manipulation program + library
C++ Qt ORM (Object Relational Mapping) and ODM library
Gerber to PDF converter
converts PostScript or PDF files to other vector graphics formats
SC is a C based meta/programming language/environment
Kile is a feature-rich LaTeX editor
Prepress preparing tool and PDF editor
A feature-rich environment for writing LaTeX documents on Windows
a graphical user interface for the PDF Toolkit (PDFtk)
Simple XML editor and XSD viewer
A PDF parsing, modification and creation library.
DNG Camera Profile editor
Convert PDF to HTML without losing text or format
Convert HTML to PDF using Webkit (QtWebKit)
Manage your collection of PDF files
Music score editor