The Gibberlings Three (http://www.gibberlings3.net/)

Like its predecessors for Baldur's Gate and Baldur's Gate II, Unfinished Business for Icewind Dale aims to restore content and quests that were omitted from the game as shipped. The additional content in this mod is based on what I can piece together from various game resources. There are six separate restorations which can be installed independently of one another.

Relevant links:
Project Page (http://www.gibberlings3.net/ub_iwd/)
Forum (http://forums.gibberlings3.net/index.php?showforum=152)
Readme (http://www.gibberlings3.net/readmes/readme-ub_iwd.html)
Download (http://www.gibberlings3.net/downloads/#ub_iwd)