Game Extender-Download this and unzip to the BG2 override directory in order to be able to continue playing after the final battle.
Experience Point Cap Remover-Unzip this to override folder and say hello 9th level spells.
Bonus Shopkeepers- This file contains the bonus shops from the extra CD's. Just unzip this to the override directory and the merchants will be in the Copper Coronet and the Adventurers' Mart.
The Game Audio Player is a program that will let you convert and play sounds from BG2.
Game Editing Utilities can be found at TeamBG.com.