All classes that implement KernelInterface

class \Drupal\Core\DrupalKernel implements DrupalKernelInterface
class \Symfony\Component\HttpKernel\Kernel implements KernelInterface, TerminableInterface
class \Symfony\Component\HttpKernel\Tests\DataCollector\KernelForTest
class \Symfony\Component\HttpKernel\Tests\Fixtures\KernelForOverrideName
class \Symfony\Component\HttpKernel\Tests\Fixtures\KernelForTest