PostScript

PostScript is a page description language and document format, used primarily with printers. It is actually a complete programming language, which the printer interprets in order to generate graphics to print.

Specifications

 * PostScript Language Reference, third edition

Software

 * Ghostscript - A free PostScript interpreter
 * Ghostview and GSview - Viewers based on Ghostscript
 * Scribus

Sample files

 * https://telparia.com/fileFormatSamples/document/ps/