.NET frameworks for XML data formatting and font editing.

Converts documents into PDF format, and PDF documents into a number of other formats for free.

Initiated by the Free Software Foundation Europe, promotes versions of PDF files which qualify as an Open Standard and provides links to open source PDF readers.

Merge, split or alter PDF files.

An ANSI C library to dynamically generate PDF files.

pdfMachine produces quality PDF files. Features include multilingual font support, editing capabilities, and integrates with MAPI compliant mail programs.

A software toolkit which performs a range of manipulations on PDF files. List of features, example usage, and downloads for several platforms. Open source GPL licence.

Free, open source PDF reader and note-taker for Mac OS X. Web site includes screenshots, a manual, a wiki and a mailing-list.

Developers of perl conversion to PDF utilities, including txt2pdf, txt2pdf PRO, jpg2pdf, jpg2pdf, data2pdf products.

Developers of acrobat plugins and tools for creating layers, increasing form usability, color production printing, image editing. Details of products and demos to download.