Mod that adds a number displaying how many items are in a stack of dropped items. I originally saw this mod in a bedwars sniping video where the person was cheating. I've seen this mod in cheat clients (probably part of itemESP) but I don't think it would be considered a cheat. Same way that the nohurtcam mod was in cheat clients but isn't considered a cheat.
OBVIOUSLY this mod would not let you see items through blocks like item esp would, simply a visual displaying the number of items in a stack of dropped items.
I attached an image from that video showing what it might look like.