Printer Pro - Print attachments, receipts, documents, web pages from your iPad and iPhone.
Printix - Printix is a cloud-based print management platform.
CalPrint - CalPrint uses your existing reminders and calendar entries on your iPad or iPhone (Exchange, iCal and Google Calendars etc.
directprint.io - Printer management for Chromebooks & Windows.
QZ Tray - Print raw (ZPL, ESC/P, FGL), HTML, PDF as well as communicate with USB, HID, and serial devices...
PrinterLogic - PrinterLogic is an enterprise print management software.