play it offline, host your own lobbies and dedicated servers, and mod it. the launcher, the runtime that loads into the game, and the dedicated server.
Global
Pumpkin is a Minecraft server built entirely in Rust, offering a fast, efficient, and customizable experience. It prioritizes performance and player enjoyment while adhering to the core mechanics of the game.
Docker image that provides a Minecraft Server for Java Edition that automatically installs/upgrades versions, modloaders, modpacks and more at startup
Luanti (formerly Minetest) is an open source voxel game-creation platform with easy modding and game creation
The most widely used, high performance Minecraft server that aims to fix gameplay and mechanics inconsistencies
TrinityCore Open Source MMO Framework (master = 12.1.5.70391, 3.3.5 = 3.3.5a.12340, cata classic = 4.4.2.60895)
A fast,scalable,distributed game server framework for Node.js.
Skynet is a multi-user Lua framework supporting the actor model, often used in games.