AxTrade
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Artillex-Studios — A lightweight but feature rich & multi-currency trade plugin with a simple configuration.
Lands - Land claim plugin
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Angeschossen — Feature rich GUI, Taxes, Settings, Flags, Easy to use, Titles, Rewards, Dynmap, Upkeep, Rent, Wars
Auction House
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Kiran — The most feature packed, up to date auction plugin on the market. 1.8-1.20 support in a single jar.
LibreLogin
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Kyngs — Open-source, multiplatform, and highly customizable authentication plugin with outstanding features.