Tools Similar to Sproxel.

Before I started writing Sproxel, I was made aware of a tool named Cube Kingdom.  It seems like it's pretty cool!  Is anyone aware of other sprite-voxel editors out there on the web?

I like the menus and the general feel of the Cube Kingdom.  At the moment, Sproxel feels a lot more technical.  This may be a good thing or may not.  I'll get a better feel for things as time goes on...