Avodocs - Free legal documents for startups in minutes
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.
Managify - Create & organize all your documents in a single platform.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Docamatic - Easily generate high quality PDF documents from HTML or templates. Fast, scalable and privacy focused PDF generation API.
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents