xmlroff is a fast, multilingual, multi-platform XSL formatter that transforms XSL-FO documents (or any XML with an appropriate XSL stylesheet) into PDF or PostScript. It aims to excel at DocBook formatting, and it integrates easily with other programs and with scripting languages.
Passepartout is a GTK-based Desktop Publishing application. It features layout templates, an XML- based typesetting engine called xml2ps, user- defined text formatting with XSLT stylesheets, support for importing EPS (Encapsulated PostScript) files and almost any raster images, text running around image (or text) frames, and printing to PostScript and EPS.
The NetBSD Ppbus Project aims to remedy some of the shortcomings of the current printer driver by porting to NetBSD a more modern implementation of parallel port support in FreeBSD called ppbus. It allows faster modes of operation, IEEE 1284 support, and a generic abstract layer that multiple devices such as printer, PLIP (parallel port Internet protocol, similar to SLIP), and Zip drives. It allows bidirectional communication and an abstract parallel port interface that devices can attach to: the many chipset implementations of the parallel port will only have to provide this common interface.
HPLIP (HP Linux Imaging and Printing) is a complete single and multi-function printing device connectivity solution for users of Linux. Supported features include a toolbox with status and maintenance functions, scanning, a CUPS backend that supports bidirectional I/O, and photo card unloading. It includes HPIJS 2.x and supports over 1000 HP printer models including Deskjet, Business Inkjet, Photosmart, Business Inkjet, PSC, Officejet, Mono/Color LaserJet, and LaserJet Multifunction Peripheral (MFP).