A Minecraft plugin API
Allows the connection of newer clients to older server versions
Arianne is an engine to develop multiplayer online games like Stendhal
A Forge mod that implements SpongeAPI
Customizable and compatible open source server for Minecraft
Minecraft Forge Hybrid server implementing the Spigot/Bukkit API
A platform for Artificial Intelligence experimentation on Minecraft
BuildCraft mod for Minecraft
Nuclear-Powered Minecraft: Bedrock Edition Server Software
Repository of desktops and programs for the Cygwin platform
MinecraftForge Server Software implementing the Spigot/Bukkit API
Charlotte's Utilities mod for Minecraft Forge made by Sharshar
A set of Forge mods for Minecraft. (API, Stargate, custom signs...)
Open Source Virtual World and MMOG Development Platform
Project SkyRealms, future of Minecraft Maps, Mods, and MORE!
Modular Minecraft server plugin - commands, events, ...
LetsPlay is a bukkit plugin.
Game Mode API for Minecraft