All classes that implement ImageToolkitInterface in Zircon Profile 8
- class \Drupal\Core\ImageToolkit\ImageToolkitBase implements ImageToolkitInterface
- class \Drupal\image_test\Plugin\ImageToolkit\BrokenToolkit
- class \Drupal\image_test\Plugin\ImageToolkit\TestToolkit
- class \Drupal\system\Plugin\ImageToolkit\GDToolkit