ShapeOko 2 CNC
The ShapeOko 2 is a CNC machine that usually uses a dremel-style rotary tool as a mill. At present, the shapeoko is still in "project" stage. It sort-of works, and has not yet been used for a serious project.
Here is the official wiki page describing it.
Here is the official list of materials and cutting settings.
Here is a list of known-working software.