Here are all the different ways that DocPad can be extended.

Module

DocPad can also be used as a module in other systems

Configuration Files

Configuration files allow you to apply site specific extensions and configurations

Plugins

Plugins provide extra functionality to DocPad, and can be re-used across Skeletons

Skeletons

Skeletons are essentially re-usable websites/projects/webapps that you've created with DocPad

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