PDFCrowd - Pdfcrowd is a Web/HTML to PDF online service. Convert HTML to PDF online in the browser or in your PHP, Python, Ruby, .NET, Java apps via the REST API.
Aspose.PDF for Java - Aspose.Pdf is a Java PDF component to create PDF documents without using https://alternativeto.
PDFSwitch - Convert any HTML document or URL to PDF with a single API request.
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
IronPDF - SDK for creating and editing PDFs.