Plugins are what drive RapidWeaver. Multiple plugins come with RapidWeaver. Stacks has become the "go to" plugin, for which many vendors are developing child stacks. Plugins extend the functionality of RapidWeaver, especially with the Foundation Theme. NimbleHost provides a plugin that reveals theme versions, RapidWeaver comes with eleven pre-built plugins and YourHead provides five, including Stacks 3, the revolutionary plugin that frees RapidWeaver design.