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.

Lunatask - All-in-one encrypted to-do list, habit and mood tracker, journaling and notes app

PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request

LiveSession - LiveSession helps you analyze users’ behavior, improve UX, find JS bugs, and increase conversion rates using session replays, and event-based product analytics.

Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents

DocRaptor - As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more