Ultra Permissions
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TechsCode — The Ultimate GUI and Command based Permissions Plugin for Spigot & Bungee & supports Custom Models
ExploitFixer
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LinsaFTW — Protect your server. Fix crash, dupe, packets exploits. The ultimate spigot security plugin.
LevelUp
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TeamVK — Mothership for various LevelUp modules such as LUP-Pickaxe
Ultra Customizer
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TechsCode — The Ultimate Customization Plugin fully controllable via GUI's w/ Script System & Custom Recipes
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.