there are other indices, but they apparently dont have options or futures trading.
for instance, http://www.marketswiki.com/wiki/CBOE_Russell_2000_Volatility_Index_Futures looks like it disappeared
There's a new one coming for NDX. Time will tell how liquid it gets. I suspect it will be better than the VX offering from CBOE.
https://www.cmegroup.com/media-room...chfuturesonnasdaq-100volatilityindexvolq.html