Plumsail Documents - Document automation software that integrates with your favorite apps to generate documents seamlessly.
Apache PDFBox - The Apache PDFBox™ library is an open source Java tool for working with PDF documents.
DocSpring - DocSpring provides a PDF filling API that makes it easy for programmers to fill out and generate PDF documents.
iTextPDF - iText offers flexible tools for PDF creation, editing and inspection.
WebMerge - WebMerge is an online platform that allows you to easily collect data, populate a document and send it to any contact automatically.
Qoppa jPDFFields - Use jPDFFields Java PDF SDK to work with interactive PDF forms in both AcroForm and XFA formats.