_Corpse tells you the faction, online status, and other information about corpses you see. That is, when you mouse over a corpse (after the player releases spirit), _Corpse automatically queries the server about who owns the body and automatically colors and fills out its tooltip like a regular living unit.
This mod is a spiritual successor to CorpseInfo, however it is significantly faster and less prone to error because it uses the friends list rather than “/who” queries. Not only that, but it's always accurate about the target's faction, and can see when enemies are online.
In battlegrounds, _Corpse uses the scoreboard data directly to instantly give you class and faction information.
It can help you decide if a corpse is worth resurrecting, because it shows online/offline status and <AFK> flags. Wondering if a dead enemy is still online and worth camping? This is your mod. It has no configuration; just install it and mouse over some corpses.