Game: Left 4 Dead, Left 4 Dead 2
Type: Mod, Source-Mod Plugin
Developer: Me

Role: Gameplay Engineer
Engine: Source
Language: SourcePawn

This is a mod that displays the health of the Special Infected when being shot at by survivors. It uses the Game Instructor hint system since you're very limited when it comes to UI stuff but it works perfectly for a situation like this! The hint will also fade if the infected is far away and it also allows for multiple hints to be displayed at the same time.