I guess there is also the Heirophant that can select the ability to make all their spells effectly reach spells for free instead of the normal +2.
You can also add to the archmage entry the Master of elements ability with is effectly free energy substitution. The Master of shaping might also qualify, I forget if shape spell is a metamagic feat or something else.
The escalation mage in Faiths of Eberron can apply Heighten, Empower, Widen, and quicken a few times a day.