Slimebeast on 08 February 2009
OOO really gives you a lot more stuff to do besides changing the nature of the game. It's huge!
Other recommended & popular quest mods in addition to OOO:
Ruined Tails Tale
Mannimarco Resurrection
The Elder Council
The Elder Council Temple of the One
Any many are eagerly waiting for this quest/faction mod (soon finished): http://www.thedarkbrotherhood.com
And if you want new awesome spells (very drastic and also new graphically):
Midas Magic Spells of Aurum
