Client/server side PDF printing in pure JavaScript
PHP library allowing thumbnail, snapshot or PDF generation from an URL
PDF transformation/manipulation program + library
Scan documents to PDF and other file types, as simply as possible.
converts PostScript or PDF files to other vector graphics formats
Online service for PDF conversion (to PDF)
A PDF parsing, modification and creation library.
Here are my python scripts written until now
Manage your collection of PDF files
Convert files with output for dot-matrix printer into PDF
Create PDF from JPEG scans and photos
PHP class for PDF
Application to modify pdf files.
PDF Library for Developers
Insert PDF into DWG in AutoCad. Autolisp Frontend for PSTOEDIT