To quickly generate Minecraft command with nbt data.

Give you item, potion or firerocket.

And Summon entity, create banner or /testfor.

More interesting function and loottable json editor.

Anything!

Like Minecraft :P

From China Minecraft Forum

Program Build-in Tutorial with html, Almost all window press F1 can open they help in your browser.

Maybe somethime I need to translate this tutorial on github wiki =3

And here is video in BiliBili(Chinese)

Thanks for feed :D