Minecraft Java 1.8 Mods
Browse 10 free mods for Minecraft Java 1.8 — popular picks include BKCommonLib, KinglyBosses, ProTPA.
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BKCommonLib
Spigot/Paper Utility Library and Minecraft Server API
KinglyBosses
KinglyBosses is a Minecraft plugin for managing custom bosses. It allows summoning powerful bosses, generating custom items, and enabling player spectating. It also offers features like boss lists, spawn zone management, and easy configuration reloading.
ProTPA
A advanced lightweight teleportation request plugin.
CyberLevels
A leveling system with custom rewards, MySQL support, and more!
TeleportPlus
Simple plugin that adds /tprequest, as well as related commands

MineRegion
This plugin will help you mine block in custom region and execute command when block broken by player (Use to give item or something else, for default file, i use mmoitems command to give item)
Storage V3
Virtual Ore&MythicMobs Items Storage For Survial&RPG
Xp Formula
Tweak the experience required for leveling up.
Yesod
Vanilla mechanism modification (applicable to RPG server)
RobotStaff
The most useful plugin for bukkit. A Robot that will answer questions when no staff are online!