Package controller provides a base structure and interface for defining and registering routes in the application.

Package di provides a simple Dependency Injection (DI) container using the `dig` library.

Package scheduler provides an interface and implementation for scheduling recurring jobs using a cron-like syntax.

Package middleware provides a simple interface and base implementation for creating HTTP middlewares.

Package module provides the definition of modules, which can encapsulate controllers and services in an application.

Package service provides a base structure and interface for defining and implementing services in the application.