Quicken Spell( Player's Handbook v.3.5, p. 98)
You can cast a spell with a moment's thought.
Automatic Quicken Spell (CAr) , Automatic Quicken Spell (ELH) , Improved Cooperative Metamagic (PG) , Innate Spell (CAr) , Innate Spell (FRCS) , Innate Spell (TB) , Mastery of the Silver Void (PE) , Multispell (ELH) , Multivoice (SS) , Spell Opportunity (ELH) , Sudden Quicken (CAr) , Sudden Quicken (MH) ,
Casting a quickened spell is a free action. You can perform another action, even casting another spell, in the same round as you cast a quickened spell. You may cast only one quickened spell per round. A spell whose casting time is more than 1 full-round action cannot be quickened. A quickened spell uses up a spell slot four levels higher than the spell's actual level. Casting a quickened spell doesn't provoke an attack of opportunity.
This feat can't be applied to any spell cast spontaneously (including sorcerer spells, bard spells, and cleric or druid spells cast spontaneously), since applying a metamagic feat to a spontaneously cast spell automatically increases the casting time to a full-round action.