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https://misode.github.io/ for loot tables, predicates, item modifiers, advancements, recipes, and worldgen
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https://mcstacker.net/ for making longer and complicated commands faster
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https://coolsa.github.io/mcCustomGuiGen/ for customs GUI's
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https://ciaccodavi.de/qbdp/acg/ for magic circles (for the ParticleConverter)
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https://minecraft.wiki/ for information