Duck Mod is a server-client mod. In other words, must installed on the server and the client for features to be accessed.

Y+C

Block entity peaking: see block entity contents without opening their inventory.
Works for all block entities that have an inventory, including Furnaces.

Furnace XP display: see the current amount of XP stored in Furnaces, Blast Furnaces, and Smokers

Bee block fill level display: see the fill level of Bee Nests and Hives

Player inventory peaking: inspect players inventory

Villager trade peaking: inspect a villager's trades

All features are configurable to use desired keybinds on client, but all functionalities require an OP'ed player to set desired features as OP not needed or OP needed