Anti-Cheating

• NoCheatPlus - NoCheatPlus attempts to enforce "vanilla Minecraft" mechanics, as well as preventing players from abusing weaknesses in Minecraft or its protocol, making your server more safe.

Blogs

Velocity

• Me4502 - Me4502's blog with frequent posts relating to Minecraft development and server ownership.

Building

• Builders-Utilities - A collection of a lot of tiny features that help with building.
• Light-Cleaner - Regenerates light levels in chunks or entire worlds to clean up dark spots. Continuation of NoLagg Lighting.
• WorldEdit - Minecraft map editor and mod.

Commands

• ACF - Annotation based Java Command Dispatch Framework.
• Brigadier - Brigadier is a command parser & dispatcher, designed and developed for Minecraft: Java Edition.
• Chimera - Command framework that does compile-time annotation processing and code generation for Bukkit plugins.
• Cloud - Command framework & dispatcher for the JVM with support for builders, annotations and a Kotlin DSL.
• Commodore - Utility for using Minecraft's 1.13 'brigadier' library in Bukkit plugins.
• CommandAPI - A Bukkit-only API for the command UI introduced in Minecraft 1.13.

Configuration

• Configurate - A simple configuration library for Java applications providing a node structure, a variety of formats, and tools for transformation.

Inventories

• interfaces - A Java user-interface library with support for Minecraft.
• IF - An inventory framework for managing GUIs.
• InventoryGui - A library for Bukkit plugins to create GUIs with inventories.
• Canvas - Canvas is a java library built for Bukkit to manage custom inventory based menus.

Maps

• BlueMap - A Minecraft mapping tool that creates 3D models of your Minecraft worlds and displays them in a web viewer.
• dynmap - A set of Minecraft mods that provide a real time web-based map system for various Minecraft server implementations.
• Minecraft-Overviewer - Render high-resolution maps of a Minecraft world with a Leaflet powered interface.

Messages

• adventure - A serverside user interface library for Minecraft: Java Edition.
• adventure-text-minimessage - Simple library that implements an easy to use textual format to send rich json messages.
• MineDown - A MarkDown inspired markup library for Minecraft chat components.
• PlaceholderAPI - PlaceholderAPI is a plugin for Spigot servers that allows server owners to display information from various plugins with a uniform format.

Other

Bukkit

• Citizens - Plugin and API for creating service side NPCs.
• EssentialsX - Plugin suite providing essential commands and features, updated for the latest Minecraft versions.
• ProtocolSupport - Support older Minecraft versions.
• ViaVersion - Allows the connection of newer clients to older server versions for Minecraft servers.

Sponge

• Nucleus - The Ultimate Essentials Plugin for Sponge.

Velocity

• Catalyst - An essentials plugin for Minecraft proxies that will provide your server with a strong baseline; giving you all the useful commands you need.

• DataSync - A minecraft plugin to synchronize and backup player data to a database
• NuVotifier - A fork of Votifier, with more robust code and vote forwarding.
• OnTime - A cross-platform player time management plugin.
• Plan - Player Analytics plugin for Minecraft Server platforms.
• spark - A performance profiling plugin based on sk89q's WarmRoast profiler.

Other Mods

• ReplayMod - A Minecraft mod to record game sessions and replay them afterwards from any perspective.

Performance

Velocity

• Aikar's Flags - G1GC Garbage Collector Flags for Minecraft.
• Krusic22's Flags - Optimized JDK11+ & ZGC flags for Minecraft servers.
• StartMC - Aikars flags script generator.

Performance Mods

• sodium-fabric - A Fabric mod designed to improve frame rates and reduce micro-stutter.
• Krypton - A Fabric mod that optimizes the Minecraft networking stack and entity tracker.
• lazy-dfu - Makes Minecraft DataFixerUpper initializatiion lazy.
• lithium-fabric - A Fabric mod designed to improve the general performance of Minecraft without breaking things.
• phosphor-fabric - A Fabric mod designed to dramatically improve the performance of Minecraft's lighting engine while fixing many bugs.

Permissions

Velocity

• BungeePerms - Alternative permissions plugin for Minecraft servers.
• LuckPerms - A permissions plugin for Minecraft servers.

Platforms

• Fabric - Next generation, highly modular and open Minecraft modding API.
• MinecraftForge - Modifications to the Minecraft base files to assist in compatibility between mods.

Protocol

Velocity

• wiki.vg - Wiki.vg has documented the whole minecraft protocol for java and bedrock edition.

• PacketWrapper - Packet wrapper classes for ProtocolLib.
• ProtocolLib - Provides read and write access to the Minecraft protocol with Bukkit.
• MCProtocolLib - MCProtocolLib is a simple library for communicating with a Minecraft client/server. It aims to allow people to make custom bots, clients, or servers for Minecraft easily.

Proxy Software

Velocity

• Geyser - A bridge/proxy allowing you to connect to Minecraft: Java Edition servers with Minecraft: Bedrock edition.
• Waterfall - BungeeCord fork that aims to improve performance and stability.
• Velocity - A Minecraft server proxy with unparalleled server support, scalability, and flexibility.

Region and World Management

Velocity

• BentoBox - Expandable Minecraft server plugin for island-type games like SkyBlock or AcidIsland.
• Chunky - Plugin for pre-generating chunks.
• Hyperverse - A lightweight world mangement plugin for Bukkit.
• Multiverse-Core - The original Bukkit Multi-World Plugin.
• PlotSquared - Plot world generator and management plugin with support for schematics.
• Prism-Bukkit - Prism is a rollback/grief management tool for Bukkit.
• WorldGuard - WorldGuard lets you and players guard areas of land against griefers and undesirables, as well as tweak and disable various gameplay features of Minecraft.
• GriefPrevention - Prevents all forms of grief - build/break, theft, spam, spawn camping, and more without a database.

Server Software

Velocity

• Nukkit - Server software for Minecraft: Bedrock Edition.
• Paper - High performance Spigot fork that aims to fix gameplay and mechanics inconsistencies.
• Sponge - A community-driven open source Minecraft: Java Edition modding platform.

Support

Velocity

• Syscraft - Subreddit, Discord community, and online resources for everyone involved in making Minecraft servers, from development to hosting to running servers.
• PaperMC - Discord, Forums: official home of the paper project, where you can download paper, and receive support.
• HelpChat - Discord: home of PlaceholderAPI and several other plugins, along with general minecraft and programming support.

Tools

Velocity

• MultiMC - MultiMC is a custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once.
• Blockbench - Blockbench is a free, modern model editor for boxy models and pixel art textures.
• pakkit - A packet monitor for Minecraft written in Electron.

Utilities

• Anvil - A cross-platform database API / ORM / entity framework with useful services for minecraft plugins
• BKCommonLib - An extensive library used in bergerhealer's plugins.
• helper - A collection of utilities and extended APIs to support the rapid and easy development of Bukkit plugins.
• Item-NBT-API - Add custom NBT tags to Items/Tiles/Entities without NMS.
• mineflayer - Create Minecraft bots with a powerful, stable, and high level JavaScript API.
• Vault - Vault of common APIs for Bukkit Plugins.
• adventure-nbt - Library for working with NBT.
• SchematicJS - JavaScript library for working with Minecraft schematics.
• SchematicWebViewer - Renders Minecraft schematics into a web canvas.
• SquirrelID - Library for working with Mojang profiles