PostScript

Adobe PostScript
The official site of PostScript, with resources, information, and links.
http://www.adobe.com/products/postscript/

Adobe PostScript Language Specifications
Official specification of the core data format/language and of several of its extensions, specification errata and supplements. Hosted by the Adobe Solutions Network.
http://partners.adobe.com/public/developer/ps/index_specs.html

Adobe PostScript SDK Archive
A compilation of documents and sample code previously distributed on CD as the Print Technologies software development kit.
http://partners.adobe.com/public/developer/ps/sdk/index_archive.html

Don Lancaster's PostScript Library
Essays and examples on PostScript programming.
http://www.tinaja.com/post01.asp

Examples from the Blue book
Excerpts covering basic graphics, printing text, applications, and modifying and creating fonts.
http://www.science.uva.nl/~robbert/ps/bluebook/

Luc Devroye's PostScript Page
Links to various Resources.
http://cg.scs.carleton.ca/~luc/postscript.html

PostScript and GhostScript Resources
Links to general information, utilities, and software.
http://www.inkguides.com/postscript.asp

The PostScript Area
Overview and history of language, explanation on how PostScript renderers work, troubleshooting database, and other basic information about PostScript.
http://www.prepressure.com/postscript

PostScript Books
Lists a couple of Adobe and third-party publications.
http://pages.cs.wisc.edu/~ghost/doc/books.htm

PostScript Language Reference
Complete list of PostScript operators, operands, and symbols. Also features a PostScript troubleshooting section, information on document structuring conventions, the OpenPress Interface (OPI) specification, and a list of books.
http://atrey.karlin.mff.cuni.cz/~milanek/PostScript/Reference/

PostScript Language Referenz
Includes, third edition.
http://www.capcode.de/help/

PostScript Manual
David Maxwell's introduction to programming in PostScript.
http://www.ugrad.math.ubc.ca/localdoc/Flat/PS-toc.html

PostScript Processing Speed Test
Benchmark for PostScript printers.
http://www.gaaj.com/ppst/

PostScript Routines
Briefly describes some pieces of re-usable PostScript code.
http://www.jdawiseman.com/papers/placemat/postscript_routines.html

Software for the Macintosh Millennium
A shareware archive of approximately thirteen thousand lines of annotated PostScript Code.
http://www.trilithon.com/pagesproducts/postscriptcode.html

Thinking In PostScript
Glenn Reid's book, generously made available in PDF format.
http://www.rightbrain.com/pages/books.html

Wikipedia: PostScript
Encylopedia article about the language and document format.
http://en.wikipedia.org/wiki/PostScript