Scan documents to PDF and other file types, as simply as possible.
PDF transformation/manipulation program + library
Split and merge PDF files on any platform
converts PostScript or PDF files to other vector graphics formats
a graphical user interface for the PDF Toolkit (PDFtk)
WorkerPDF is GUI for GhostScript created for PDF conversion
Booklet, Signature generator, Imposition
Application to inspect text and images of pdf books.
Online service for PDF conversion (to PDF)
High Volume Variable Data Printing & Mail Merge in PDF format
A PDF parsing, modification and creation library.
Here are my python scripts written until now
Manage your collection of PDF files
Create PDF from JPEG scans and photos
PHP class for PDF
Mini SDK JavaScript API library PDF web apps
Application to modify pdf files.
PDF Library for Developers