| Horde_Group_Base | Horde_Group_Base is the base class for all drivers of the Horde group system. |
| Horde_Group_Exception | Exception handler for the horde/Group package. |
| Horde_Group_File | The Horde_Group_File class provides an implementation of the Horde group system for integration with /etc/group or a custom group file. |
| Horde_Group_Kolab | This class provides a Kolab driver for the Horde group system. |
| Horde_Group_Ldap | This class provides an LDAP driver for the Horde group system. |
| Horde_Group_Mock | This class provides a mock driver for the Horde group system. |
| Horde_Group_Sql | This class provides an SQL driver for the Horde group system. |