We have our own stacking and it is not same as Cisco, as we can form stack on ICXs.
It is irrelevant as I doubt Cisco virtual stacking will interoperate with non Cisco Switches.
But yes we do support stacking.
Please check link below for our stack features:
fROM THE GUIDE :
A stack is a group of devices that operate as a single chassis.
A Ruckus stack contains from two to 12 units configured in a ring or linear topology. The units in a stack are from the same model family; that is, a stack can be an ICX 7150 stack, an ICX 7250 stack, an ICX 7450 stack, an ICX 7650 stack, an ICX 7750, or an ICX 7850 stack.
Hope this helps.