Only 2 come to mind:
JavoEdge Axis case and the Tuff-Luv Bi-Axis Napa case.
The JavEdge Axis case, IMO, is a superior design, because you can easily set it up to whatever angle you want. The Tuff-Luv requires snapping and unsnapping (but which may be a benefit to some people because the snaps make the case more stable).