First Aid is a minecraft mod that changes the vanilla health system to be split up into different parts. Armor is only taken into consideration for the part that is currently being damaged, e.g. when you hurt your foot, the armor in the foot slot will be damage. It also introduces debuffs to make your life harder. These can be constant (as long as you don't heal your body) or on hit. The version by Ichtt has a game/server breaking bug in it. In this version that bug plus some other stuff is fixed.
First Aid is primary licensed under the GPL version 3 as in LICENSE and so is this.
However, there is one exception: The API package is licensed under the LGPLv2.1 as in API_LICENSE
This project currently uses the heartbeat sound from http://soundbible.com/2162-Human-Heartbeat.html. It is licensed under the Attribution 3.0 license. Special thanks!
Also, thanks to ichttt for making the original mod and making it under GPL.
https://legacy.curseforge.com/minecraft/mc-mods/uls-firstaid-fork