Neat

Yes. That is a spin on Tidy Plates.

(full resolution) 

Neat is a mod that adds Unit Frames to the top of every entity. That image is a good example of it.

Features:

• Fully client sided
• Health bars only show up if the mob is not obstructed
• Health bar color changes depending on the mob's health % (green to yellow to red)
• Shows the mob's attribute (for Smite or Bane of Arthropods) and their armor
• Groups up health bars for mob stacks (like spider of chicken jockeys)
• Works with minecraft's Scoreboard Teams. Mobs and players in teams will have a colored name.
• Configurable (both in and out of game)
• A keybind to toggle the health bars (as of -17)

Configuration:

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