Merb consists of the following parts:

The core of merb provides the following gems:

• merb-core: Core functionality needed to bootstrap and run an application.
• merb-action-args: Plugin to handle request parameters as parameters to controller actions.
• merb-assets: Asset handling.
• merb-slices: Slices are merb's application modules.
• merb-cache: Support for content caches, e.g., memcache.
• merb-gen: Generators for applications, plugins, and components.
• merb-haml: Support for HAML
• merb-helpers: Helpers for text and HTML formatting.
• merb-mailer: MVC mail sending from an application.
• merb-param-protection: Filter request parameters in controllers and logs.
• merb-exceptions: Exception notifications as mail and through web hooks.