[throwaway54-762]

There are a couple projects in this direction (I looked into trying to make a bot at one point). Unfortunately, any names have slipped my memory at this point. But be assured, they exist.

[mappum]

Voxel.js is one: http://voxeljs.com/

[joshu]

In what way is this a minecraft client?

[mappum]

Well it's not technically Minecraft, but obviously heavily inspired. I'm pretty sure I heard about someone hooking it up to the real protocol.