Over at the official forums, Grimiku has clarified that 3rd-party mods like DarkD3 are not allowed in Diablo III. Here is the full post:
Blizzard Tracker: May 25, 2013
As we have mentioned many times before, 3rd-party mods are not allowed in conjunction with Diablo III, period. We do not support them, and choosing to use them may lead to penalties taken against your account, up-to and including permanent account closure.
As such, I would highly suggest you check out this blog post for further information.
Additionally, posting links to these mods is against the forum's Code of Conduct, and is not permitted on the forums.