OpenPDF

OpenPDF is an open-source Java library for creating and modifying PDF documents programmatically. It is a fork of iText 4 and is used by developers who need PDF generation inside Java applications, servers, or document workflows.

It supports common PDF tasks such as writing text, tables, images, metadata, and basic security settings, and it can read or alter existing PDFs in many cases. A distinguishing trait is its LGPL/MPL licensing, which makes it a practical option for teams that want an iText-style API without using newer commercial iText releases.