Yep. SCT (scrolling combat text) is the standard. SCTD (sct Damage) shows your damage done. They're also available at
www.wowace.com/files - make sure you get the options, too. If you want to add spell/ability cooldowns into your SCT, get SCTCooldowns from Curse.
Another floating text mod is called Mik's Scrolling Battle Text. It has some different fonts, different animations, and is more customizable than SCT. It's available the opposite of SCT. MSBT is on Curse and it's cooldown plugin, MSBT Cooldowns, is on wowace.