Mazzle uses Antagonist (for bars) and WitchHunt (for announcements)
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
As a note, you may want to go into Antagonist and make sure it's configured to show castbars for spells you are not the target of, as i don't believe that's the default. Soloing you'd never notice, but in a group/raid, it becomes very obvious.