Including the above and my additions...
1. Base Class based: Barbarian's Whirling Frenzy, Monk's Furry of Blows, Paladin's Lion Legionnaire.
2. PrC based: Shou Disciple's Martial Flurry, Exotic Weapon Master's Flurry of Strikes, Frostrager's One-Two Punch.
3. Feat based: (G/I)TWF, (Greater) Rapid Strike, Snap Kick, Slashing Flurry, Eagle's Fury, Lightning Fists, Planar Touchstone[Oxyrhynchus].
4. Enhancement based: Haste, Bracers of Blinding Strike, Speed, Valiant Fury, Righteous Wrath of the Faithful, Sakkratar's Triple Strike Spell.
5. Maneuvers: Dancing Mongoose, Raging Mongoose, Flashing Sun, Time Stands Still.
6. Uniques: Feat:Deepspawn, Enhance:Splitting, Weapon:Ghost Marble(?), Weapon:Fukia-mouthdartsomethingerish, Master Thrower's Double Toss.
You can also simply look into picking up Natural Weapons.