MobHealthBars
Adds dynamic healthbars to mobs without modifying their names
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MobHealthBars
MobHealthBars

MobHealthBars is a plugin that adds healthbars to your server without interfering with the mob's name, and without revealing mobs that players can't otherwise see.
The healthbar is a separate entity that only appears when a player looks directly at a mob, and it disapears 5 seconds later (if a mob goes 5 seconds without being directly looked at by a player, the healthbar disapears).
The healthbar changes color based on the percentage of health that is remaining. - Green: 90%-100% HP - Yellow: 50%-90% HP - Orange: 10%-50% HP - Red: 0%-10% HP
The healthbar used to be a TextDisplay entity, but for some reason TextDisplays collide with projectiles, so healthbars were switched to being invisible armorstands (which don't collide with projectiles thanks to the marker tag).