There have not been any modding tools released. Before D2:ED was finished Larian said they would like to release such a toolset, given enough time and resources without more pressing priorities (see the old topic
Is it modder-friendly?). However, work on Divinity 3 has started and they have several other projects going in addition to finishing off stuff related to FoV and DKS, so I don't know if I'd hold out much hope.
AFAIK there was only a texture mod for D2:ED, other than language conversion hacks.
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