iTextPDF is described as 'The leading Java and C# PDF Library SDK. A programmable Java and .NET PDF SDK library to create, manipulate and edit PDF documents. Convert Html files to pdf, Debug pdf files, extract data from PDF and more' and is an app. There are more than 10 alternatives to iTextPDF for a variety of platforms, including Windows, Linux, Mac, Self-Hosted and Debian apps. The best iTextPDF alternative is ZingPDF. It's not free, so if you're looking for a free alternative, you could try ZingPDF or PDFSharp. Other great apps like iTextPDF are jPDFText, jPDFProcess, ReLaXed and Docotic.Pdf.
jPDFPreflight is a Java PDF library SDK used to verify PDF compliance with different standards, including PDF/UA, PDF/A and PDF/X and to convert documents to these standards.
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PDF Clown is an open-source general-purpose library for manipulating PDF documents through multiple abstraction layers, rigorously adhering to PDF 1.7 Specification.
