jPDFFields allows your application to get and set field values.
iTextPDF - iText offers flexible tools for PDF creation, editing and inspection.
PDF to X - PDF to X is used to convert PDF documents to Word (.doc)/WordPad (.rtf) documents, HTML web pages, JPG/PNG/BMP/TIF/GIF/PCX/TGA images and plain text files in batch mode. It works without Adobe Acrobat or Adobe Reader.
iText - iText is an intuitive and refined text editor with word processing completely rewritten in Cocoa...
IronPDF - SDK for creating and editing PDFs.
Post.As - A simple tool to publish _____ on the web
Author - Mac app that changes how you can create and publish documents to the web.