Nirsland's Modpack Utilities

The mod bundles a number of minor utilities aimed at modpack developers, such as add-ons that replace files in the root Minecraft folder and item replacements set in its config. Add-on zip files go in the addons folder inside .minecraft, and a button in the config toggles them on or off. Item replacements swap one item for another across recipes, trades, block drops and mob drops, but items already in a recipe output or trade output are left unchanged. The config includes an example that swaps a modded copper ingot for the vanilla copper ingot. The mod runs on client and server, and it is released under the MIT License, though it is not open source. Files exist for 1.20.1 only.