DHL Versenden for Magento 1
The module for Magento 1 can be found on the Magento Marketplace.
DHL Shipping for Magento 2
The module for Magento 2 can be found on Github.
DHL Intraship (deprecated)
The Intraship module has reached its End of Life. Users of the Intraship module need to migrate to DHL Versenden / Shipping.
The last version is attached to this article for reference purposes. Do NOT use Intraship for new installations. It is no longer maintained or supported.
Here is a list of all documentations.