jPDFAssemble is a Java library to assemble PDF files. jPDFAssemble can combine, merge, or split PDF documents. jPDFAssemble also allows to add or manipulate bookmarks in PDF documents.
Aspose.PDF for Java - Aspose.Pdf is a Java PDF component to create PDF documents without using https://alternativeto.
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents
PDFsam - PDFsam Basic, a free, open source, multi-platform software designed to split, merge, extract pages, mix and rotate PDF files
IronPDF - SDK for creating and editing PDFs.
PDFium - The C# PDF Library to Create and Edit PDF documents in .
iText - iText is an intuitive and refined text editor with word processing completely rewritten in Cocoa...