Structures included by default for mods:

Mekanism
Mekanism Generators
NuclearCraft: Neoteric
Tinkers Construct
Immersive Engineering
Blood Magic
Extreme Reactors

Kube JS support:

MbtoolKJSEvents.InitMbtoolStructures(event => {
for(let i = 0; i < event.structures.length; i++) {
console.log(event.structures[i].getId());
console.log(event.structures[i].getName());
console.log(event.structures[i].getStructureNbt());

event.structures[i].setStructureNbt(CompoundTag.fromJSON({})); // set structure nbt (you can use this to change the structure, but be careful!)
}
});

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Description for 1.20+

SHIFT+use to open GUI
SHIFT+SCROLL to rotate structure before placement
Multibuilder Tool has own inventory where you store blocks needed for building
Better structure selection GUI with search field and multiblocks previews
Implemented server-client sync. When client joins the server, it will have only structures what server sent
Easy to add new structures. In your data pack locate NBT structure files in following path: data/mbtool/mbtool_structures/my_custom_structure.nbt
Add translations for your structure: "mbtool.structure.my_custom_structure": "Your structure name"

Description for MC 1.12.2

Supports structures from: Mekanism, Immersive Engineering, Immersive Petroleum, NuclearCraft, QMD, IC2, TConstruct, Extreme Reactors, Draconic Evolution

Add your own multistructures.