| HelperInterface | HelperInterface is the interface all helpers must implement. |
| DebugFormatterHelper | Helps outputting debug information when running an external program from a command. |
| DescriptorHelper | This class adds helper method to describe objects in various formats. |
| FormatterHelper | The Formatter class provides helpers to format messages. |
| Helper | Helper is the base class for all helper classes. |
| HelperSet | HelperSet represents a set of helpers to be used with a command. |
| InputAwareHelper | An implementation of InputAwareInterface for Helpers. |
| ProcessHelper | The ProcessHelper class provides helpers to run external processes. |
| ProgressIndicator | |
| QuestionHelper | The QuestionHelper class provides helpers to interact with the user. |
| SymfonyQuestionHelper | Symfony Style Guide compliant question helper. |
| TableCell | |
| TableRows | |
| TableSeparator | Marks a row as being a separator. |
| TableStyle | Defines the styles for a Table. |