Client/server side PDF printing in pure JavaScript
OctoPrint is the snappy web interface for your 3D printer
OpenPrinting CUPS Sources
Optimized firmware for RepRap 3D printers based on Arduino platform
A Label Printer Application
Zasilkovna.cz PHP library supporting SOAP and REST API + custom Label
Haskell pretty printer
Powerful desktop publishing software
Hewlett-Packard's Linux imaging and printing software
Free Java Reporting Library
Reporting tool, libraries and designer
Easy lead sheets from text input
Modular XSL-FO Implementation for Java.
Insert and manage Linux computers in AD
Easy-to-use print report library and designer
Bar Code (1D or 2D) generator in pure Ada
Monitorize number of pages printed by any printer on your network