MetaMorph
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AlbusThePenguin — Fully customizable GUI, Unlimited Item Models, Customizable Messages (Resource pack tool)
AxEnvoys
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Artillex-Studios — An envoy plugin that may or may not have great customisability, but it certainly has great performan
DeliveryBoard
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NukeGH05T — First ever procedurally generated deliveries with timed intervals | IA, ORX , MMOI, EI, EcoI & CUI
MMOProfiles
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Indyuce — Create multiple profiles and customize your Minecraft experience with MMOProfiles.