An introduction to polymorphism and design patterns, by John Brewer. Includes links and source code.

Design patterns for many uses: graphic user interfaces, Web, mobile interface; background information, links to literature and other collections.

A collection of idioms for Unix shell programming

Not using patterns is one of the most common anti-patterns. Article describes where patterns are appropriate, what happens when they are not used, and why one must be very familiar with them. The Retrospector.

Several articles on different aspects of the topic.

Very useful pattern information. Includes articles as well as discussions in the form of the WikiWikiWeb.

Fine resource on many aspects of patterns, anti-patterns, and pattern languages.

Contains patterns, links and literature on object/relational database access layers.

Tool support for object-oriented (design) patterns.

Information about forthcoming and past PLoP conferences.