QZ Tray - Print raw (ZPL, ESC/P, FGL), HTML, PDF as well as communicate with USB, HID, and serial devices...
Printix - Printix is a cloud-based print management platform.
Printer Pro - Print attachments, receipts, documents, web pages from your iPad and iPhone.
directprint.io - Printer management for Chromebooks & Windows.
PrintNode - PrintNode offers cloud printing solutions for web applications.
ezeep - ezeep provides managed cloud printing solutions for educational institutes and SMB's.