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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/

Affordable PDF Tools
Merge, split or alter PDF files.
www.a-pdf.com/

Panda PDF Generator
Panda is an open source PDF generation API.
www.stillhq.com/

PDF Converter
Submit documents online to be returned as PDF.
www.pdfconverter.com/

Guru's Lair: Acrobat PDF and SVG Graphics Library
Tutorials and utilities to help use Adobe Acrobat version 4 and above.
www.tinaja.com/

PDF.Net
A cross-platform PDF library used to read, write and edit PDF documents. Available as a .Net component and as a C++ library. By pdfTron.
www.pdftron.com/

Siberix PDF Library
Create industry standard PDF files.
www.siberix.com/

Online PDF to HTML Conversion
Web form translating arbitrary PDF files to HTML, hosted by Adobe. Designed specifically to make PDF accessible to people with disabilities.
www.adobe.com/

PDF Converters
Contains information and resources of free, shareware, and commercial document conversion software.
www.pdfconverters.net/

Creating PDF Documents for Free
Links to free Web services, freeware applications, and Open Source programs generating PDF files from a variety of other formats. Aimed mainly at Microsoft Windows users.
www.pruittfamily.com/