The Apache PDFBox library is an open source Java tool for working with PDF documents.
PDF renderer implementation supporting the subset of PDF 1.4 specification.
The Apache Preflight library is an open source Java tool that implements a parser compliant with the ISO-19005 (PDF/A) specification. Preflight is a subproject of Apache PDFBox.
YaHP is a java library which permits to convert an html document into a pdf document.
Content parser for files of the mimetype "application/pdf".
A library for reading, writing and manipulating PDF files.
Create PDFs using plain old HTML+CSS. Uses wkhtmltopdf on the back-end which renders HTML using Webkit.