"The VipRiser is extensible virtual PDF printer for OS X, with abilities to send output directly to your iPad for easy reading, letting others annotate it online using the CrocoDoc or share the file with others using the DropBox account, all built-in. "

"create basic pdf files in the browser or node.js, simple as cake"

"jsPDF generates PDF documents using nothing but Javascript. You can use it in a Firefox extension, in Server Side Javascript and with Data URIs in some browsers."

PDFMiner is a suite of programs that aims to help analyzing text data from PDF documents. It includes a PDF parser, a PDF renderer (though only rendering text is supported for now), and a couple of nice tools to extract texts.

Uses PDFKit to display PDFs in Firefox 3/OS X 10.4+

“CSSToXSLFO is a utility which can convert an XML document, together with a CSS2 style sheet, into an XSL-FO document, which can then be converted into PDF, PostScript, etc. with an XSL-FO-processor.”