MCJava
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jojodmo — Run Java Code from the Chat • Code plugins completely in-game • Beautiful Syntax Highlighting
BottleRecycling
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TeamVK — Useful for KitPvP!! You can get rid of the empty bottle/bowl after you drink the pot/soup.
ExploitFixer
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LinsaFTW — The ultimate antiexploit plugin now in an updated format with new security measures for your server.
ChestLock
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Black1_TV — The fastest plugin that allows players to lock their chests and other blocks.
FreeRank
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davidxxd — Give Your Players a Free Rank with a Single Command in Minecraft