Bukkit

Allows user to rate and comment structures in the Minecraft world

Create programs to control a robot to build structures or mine for you

Allows players to create worlds that then can be experienced by others through instancing.

CodeBlocks 2

Allows players to launch sheep and other enitities from a predifined location with pre set velocity into the world

Place kiosks in the world with image and descriptiopn GUI. Use to create a museum etc.

Allowa players to create and use all new crafting system

Import image files into Minecraft world

Import .obj files into the Minecraft world

Create regions that apply velocity or acceleration to players

RegenBlock beta 2.2 - Regenerate destroyed blocks on a timer