Target and damage indicators
D2X-XL v1.8.13 and up now offers target and damage indicators in various flavors. You can have rectangular brackets around an object, or a red arrow above it, that points down to it.
Target and damage indicators can be enabled separately. The triangular target indicator has the damage indicator integrated.
Of course this is all server controlled in multiplayer games and not available if the server does not use D2X-XL.