I checked and I missed quite a lot.
Watcher's Keep: Taralash +4 (bow), Firetooth +4 (crossbow), Dagger of the star +4, Angurvadal +4 (longsword), Usuno's blade +4 (ninja-to), spectral brand +4 (scimitar), shortsword of Mask +4, Ixil's nail +' (spear), Erinne's sling +4, Staff of the ram +4
Regular SoA: Mana bow +4, Boneblade +4 (dagger), FLail of ages +4, Dragon's breath +4 (halberd), wave +4 (halberd), cutthroat +4 (shortsword), staff of the woodlands +4, Sling of Arvoreen +4, Carsomyr +5, Warblade +4, Soul Reaver +4, Crom Faeyr +5, Spear of withering +4.
I don't think the Bows and Slings count as they use the ammunition bonus to determine what they can hit. The only exceptions are those that generate their own ammo like the Short Bow of Gesen +4 and Sling of Everard +5.