HotDocs - Template-driven, automated document & form assembly software
Aspose.PDF for Java - Aspose.Pdf is a Java PDF component to create PDF documents without using https://alternativeto.
WebMerge - WebMerge is an online platform that allows you to easily collect data, populate a document and send it to any contact automatically.
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents
Carbone - Generate and convert any document efficiently
IronPDF - SDK for creating and editing PDFs.