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Many custom unit frames do this such as ZAM's, Factory Tactical Combat, ggFrames, Warlegend, and I'm sure there may be others by now. These are for the player and target frames though.
I do not know if any do it for the default bars.
I have yet to see anyone modify the floating hp bars above heads, but I don't think it's possible with the current API. I would love to be corrected on that though.
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