https://pdfswitch.io/ is a high-quality, easy to implement HTML to PDF conversion API. Easily generate PDF invoices, tickets, reports and documents with HTML to PDF API. Lightning-fast service, rich features, code samples for Java, C#, PHP, Python, Ruby, Go, Nodejs.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
PortableSigner - PortableSigner is a signing (with X.509 certificates) program for PDF files.
HTML PDF API - Easily generate PDF documents from HTML code with our powerful API
PDF24 PDF Creator - Create PDF and convert documents to PDF for free with the free PDF24 PDF Creator.
pdflayer - Free, powerful HTML to PDF API supporting both URL and raw HTML conversion. Unlimited document size, lightning-fast and compatible PHP, Python, Ruby, etc.
Apache PDFBox - The Apache PDFBox™ library is an open source Java tool for working with PDF documents.