DupeTrigger

DupeTrigger adds a keybind that doubles the stack the player is holding. Each press doubles the stack count, and the count is not capped at 64, so a stack keeps doubling well past the normal limit. The count tops out at the integer limit of 2,147,483,647, so the largest possible stack is just under 2 billion. Once a stack passes 1,000, the count label is shortened so it stays readable, and the text scales to fit inside the slot, so a value such as 999M still fits.

The mod is built for the Cheats setting, which must be enabled before players can duplicate items in a world. It is a Fabric mod for versions 1.21.4 – 26.3, with six release versions in total, and it is published with its source code and issue tracker. The environment is client and server, so the server and every player need it, and the code is under the All rights reserved license, which means the mod is not open source.