Commander

Automatically converts command-line arguments to Swift types like Int or String, with built-in validation and user-friendly error messages, as demonstrated in the README's examples for reducing parsing boilerplate.

Enables logical organization of multiple commands into hierarchies, improving CLI structure and UX, shown in the Group example where login and logout commands are neatly grouped under 'auth'.

Descriptive argument descriptors for options and flags automatically produce help text, reducing manual documentation effort, as illustrated in the --help output examples.

Built around core protocols like ArgumentConvertible, allowing easy customization and extension for custom types, mentioned in the README for adding support beyond built-in types.