ArchitectureGuide.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/

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/

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

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

Divido PDF
A .NET component that simplifies the task of generating PDF documents from .NET applications from any data source such as XML documents, HTML forms, or databases.
www.dividosoft.com/

Jaws PDF Library COM Edition
A PDF library for integrating PDF creation within application. Available to OEMs, ISVs, and System Integrators. [Commercial]
www.jawspdf.com.hk/

PDF on the Fly
Perl5 library for creating PDF files. Free for personal use, and commercial licences can be arranged.
www.eprg.org/

Text Into PDF
A DLL allows to programmatically convert any string of text, or a text-based file into PDF format. [Commercial]
www.txtn2pdf.com/

PDF Creator
Sells the 5-Minute PDF Creator, an Adobe Acrobat tutorial and self-publishing guide.
pdfcreator.com/