PDFMint

HTML, Markdown or a URL to PDF or PNG, with a no-key demo endpoint and a free tier

Official docs outline

Extra Credit builds an outline of PDFMint's docs the first time your work uses it. Until then, start at the official documentation.

Mattermost An open source platform for developer collaboration
Mercury Web parser
Monday Programmatically access and update data inside a monday.com account
OCR.Space OCR text extraction from images and PDFs with a free tier
PandaDoc DocGen and eSignatures API
PDFFleet HTML and URL to PDF API with templates and a free tier
pdfrender HTML and CSS to PDF with page headers, footers and page numbers, no headless browser
Pocket Bookmarking service
Podio File sharing and productivity
PolyDoc HTML/URL to PDF and screenshots, plus Factur-X/ZUGFeRD e-invoices; free tier
PrexView Data from XML or JSON to PDF, HTML or Image
PrintSocket Send PDFs, ZPL labels and ESC/POS receipts to your own printers from any language; free tier