Neat

Neat from the author of Vazkii - indicator of HP (life) of mobs, a mod for displaying the health of mobs in minecraft

Some lightweight replacement for DamageIndicators. Shows the name and health of the mob, it is very useful and convenient to know and see the health bar above the player or monster. It is especially useful when you play with mods and add mobs, bosses that have a huge amount of lives.

Peculiarities:

Display indicator only when there are no obstructions
Client mod, i.e. does not require presence on the server
Changing the color of the HP indicator
Fully customizable