No longer in active development, but PR's are open.

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This mod exposes nearly everything inside item and block class to Crafttweaker. Which means you can make something like a prospector wand, or a block that changes the color of a beacon beam, or create types of blocks that would be otherwise impossible with scripts alone.

Some things you can create with this mod:

Combat-related enchantments
Fully customizable potions
Replicas of Avaritia items
Fences, fence gates, slabs, ladders and stairs
Rotatable blocks like Pumpkins
A basic crop like Wheat
A basic crop like Cocoa Beans
A basic crop like Pumpkins/Melons
A tall crop like Immersive Engineering/BWM Hemp
Crops that require a block next to it to survive
A bow that creates goofy particles when you aim it
Material items and blocks like ContentTweaker (a.k.a B.A.S.E)

How To Use:

Your script file should start with #loader preInit
You should use ResourceLoader to load item/block models, textures and blockstates. (I recommend checking how to change minecraft resources)

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At the moment there is no proper Wiki. Please interpret the source code for ZS Methods or view RoTN's implementation as an example.

You can use use this mod in any private or publicly distributed pack, and you can use it outside of CurseForge, too.