OctoPrint is the snappy web interface for your 3D printer
Java Web Printer
Wubiq. Printing from anywhere, everywhere.
Apple CUPS Sources
Qt based report solution
Un piccolo server domestico con il Raspberry
A tool that makes printing multi sided documents an easy task.
although fully functional, this is a pre-framework that you can extend
Bangla Computing and Localization Project
A publishing workflow management system