Modular Machinery Reborn is a Minecraft NeoForge mod currently developed for Minecraft 1.21 and 1.21.1
This mod can be used to create custom multiblock machines and recipes for them.
You can find some working examples of Modular Machinery Reborn here
You can download the full test datapack here (It can takes a few seconds to complete the files zipping) Just download the zip and extract it in World/datapacks/test_datapack/ (you can replace “test_datapack” with what you want)
Download this mod on CurseForge
This mod is under the GNU LESSER GENERAL PUBLIC LICENSE
Btw you are free to use this mod in any modpack.