The Gang of Four (GoF) patterns are generally considered the foundation for all other patterns. They are categorized in three groups: Creational, Structural, and Behavioral. Here you will find information on these important patterns in the C# language and in UML. More info

Java Design Patterns reference and examples. More info

This site has indexes of many of the patterns available online. More info

Perl design patterns with examples and reference material related to perl development. More info

Collection of J2EE patterns. More info

The PatternShare community site brings together software patterns from different authors in one place to show relationships between existing patterns and to encourage you to contribute new ones. By combining our efforts, the patterns community can increase pattern usage and better meet the needs of developers and architects who use patterns. More info

phpPatterns has three goals. Raising awareness and bringing PHP to the Enterprise Creating understanding of PHP‘s Advanced Capabilities (such as Object Oriented Development) Applying Software Design Patterns to PHP. The bottom line is quality not quantity. More info