Oldies

Baldur's Gate 1
http://www.gog.com/forum/baldurs_gate_series/newbie_guide_modding_bg1_if_you_buy_bg1_bg2_from_gog/page1

Neverwinter Nights
http://nwvault.ign.com/View.php?view=Other.Detail&id=1443
http://nwvault.ign.com/View.php?view=Hakpaks.Detail&id=7848

PlaneScape Torment
http://thunderpeel2001.blogspot.fr/2009/01/planescape-torment-fully-modded.html