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.
Hellofax - Easy. Reliable. Online faxing. Send & receive faxes from anywhere.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
GotFreeFax - Send Free Fax Online to the U.S. and Canada.
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents
faxZero - Internet fax application.