A Minecraft server written in C# with a large focus on concurrency (multi-threaded) and plugin support. Custom code provides new functionality to existing Minecraft features - this includes new biomes, realms, and populators. Has a robust and customizable terrain generator and easy plugin capabilities for new features.
Bukkit Plugin Kit is basic codegenerator which generates base code to quick start developing plugin for Minecraft (http://www.minecraft.net ) server mod bukkit. See http://www.bukkit.org