| Bootstrap | Bootstrap class |
| Config | Config class |
| Container | Implements a simple PSR-11 container |
| Event | the Event class for implementing a hook/event system |
| Registry | the Registry class for implementing a registry |
| Response | the Response class is responsible for sending a HTTP response to the client |
| ServiceLocator | the Service Locator class |
| Session | the Session class for implementing a session |
| Utility | Utility class |