"The Free Software Foundation is working to develop a set of libraries and programs that implement the PDF file format. Even non-developers can contribute to the cause.
"The Free Software Foundation has initiated an effort to offer Free Software implementations of the PDF file format. According to the web page setup for donations, 'The GNU PDF project is developing a free, high-quality and fully functional set of libraries and programs that implement the PDF file format and associated technologies to the coming ISO standard, ISO 32000...'"