This entity is outdated, still works though, but download the new version if you need :
This thing is useful for Gmod Machinima Video Makers and Screenshots
Note : This entity does not heal/charge peoples, just a medigun beam
Check Gold and Uber Materials Here :
How to install?
Put it on "C:\Program Files\Steam\steamapps\Username\garrysmod\garrysmod\addons"