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JPEDAL (Java Pdf Extraction Decoding Access Library)
An library for rasterizing and extracting content from PDF files in Java. [Open source, LGPL]
www.jpedal.org/

PDFGo Java viewers and beans
PDF viewing bean for applets or applications. [commercial]
www.pdfgo.com/

DynamicPDF Generator for Java
A Java class library for the generation of PDF documents based on dynamic data. By ceTe Software. [Shareware]
www.cete.com/

ElegantJ PDF Library
A Java class library that enables publish reports and documents in PDF format from application. [Commercial]
www.elegantjbeans.com/

Big Faceless PDF Library
Create PDF documents with include full Unicode support and TrueType and Type 1 font embedding. [Commercial w/ Evaluation]
big.faceless.org/

XEP
XSL-FO to print (PDF or PostScript) converter written in Java. [Commercial]
xep.xattic.com/

Etymon PJX
Class library with support for reading, combining, manipulating, and writing documents. [Commercial w/ Evaluation]
www.etymon.com/

pj
Parses, manipulates, and generates PDF files. It also includes pjscript, a script interpreter for dynamically creating and modifying PDF files. [Open Source, GPL and commercial]
www.etymon.com/

Big Faceless Report Generator
Java Report Writer to convert XML to PDF. Creates dynamic reports with JSPs and Servlets. Features include encryption, bar codes, graphs and charts, custom fonts, Unicode support. [Commercial w/ Evaluation]
big.faceless.org/

jPDF
A server-side API to publish, serve and handle PDF/FPF documents. [Commercial]
www.crionics.com/