The most prominent A330 mod currently is the (an open-source modification originally based on the Asobo A330-900neo).
Before Headwind took over, "The Salty Sims" team attempted an A330 mod. While no longer updated, many users on ModsFire still download the "Salty 1.4 Final" for older versions of MSFS (SU10/SU11). It is lightweight and easier on FPS than the Headwind mod. a330 modsfire