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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/

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/

Vienas Reports
A lightweight PDF report generator.
www.vienas.ch/

Qoppa Software
Provide Java based PDF tools includes: jPDFViewer integrate a PDF viewer directly in Java applications and applets; jPDFProcess is a Java library that can read, modify and then save or print PDF documents; jPDFWriter is a Java class library that allows to create PDF documents by using standard Java APIs to draw text and images. [Commercial]
www.qoppa.com/

JustFormsPDF
A Java library for creating/editing PDF forms on-the-fly. This library requires no other packages to be installed and will run easily from Servlets, JSPs or EJBs. [Shareware]
www.justformspdf.com/

PDFTextStream
A Java library that specializes in extracting text and metadata out of PDF documents. Supports extraction from encrypted PDF files, and integrates with Jakarta Lucene to enable indexing of PDF document content.
snowtide.com/