PaperMC / Paper

The most widely used, high performance Minecraft server that aims to fix gameplay and mechanics inconsistencies

PaperMC / Velocity

The modern, next-generation Minecraft server proxy.

webbukkit / dynmap

A set of Minecraft mods that provide a real time web-based map system for various Minecraft server implementations.

GrimAnticheat / Grim

Fully async, multithreaded, predictive, open source, 3.01 reach, 1.005 timer, 0.01% speed, 99.99% antikb, "bypassable" 1.8-1.21 minecraft anticheat.

Slimefun / Slimefun4

Slimefun 4 - A unique Spigot/Paper plugin that looks and feels like a modpack. We've been giving you backpacks, jetpacks, reactors and much more since 2013.

PaperMC / adventure

A user-interface library for Minecraft: Java Edition

LegacyLands / legacy-lands-library

Enterprise-grade modular framework for Minecraft server development with multi-tier caching, Redis Streams, resilient data processing, and modern Java concurrency. Built on Fairy Framework for production-scale plugin development.

PolyhedralDev / Terra

Voxel world generation modding platform

MockBukkit / MockBukkit

MockBukkit is a mocking framework for Bukkit/PaperMC to allow the easy unit testing of Bukkit plugins.

henkelmax / simple-voice-chat

A working voice chat in Minecraft!

CitizensDev / Citizens2

Citizens - the premier plugin and API for creating server-side NPCs in Minecraft.

IntellectualSites / PlotSquared

PlotSquared - Reinventing the plotworld

WesJD / AnvilGUI

Capture user input in Minecraft through an anvil GUI in under 20 lines of code

CryptoMorin / XSeries

Library for cross-version Minecraft Bukkit support and various efficient API methods.

EndlessPixel-Studio / FakePlayer-CE

Community-maintained continuation version of the FakePlayer plugin