How could you forget the Equalizer as an offhand weapon, Alson?
There's also another class, the "Secondary Quick Weapons:"
Daystar
Ilbratha
Ras
Mace of Disruption+2
Namarra
Sword of Balduran
Purifier
Things that you carry in your Quick Weapon slots, not because you actually want to
hit anything with them, but for the spells they can cast or the immunities they confer. (See a nasty spell heading your way? Let go of the Celestial Fury and grab the Purifier.)