CBOE S&P 500 3-Month Volatility Index
If you require data in a format not related to NinjaTrader then you can browse our free sample data options for historical daily data, for intraday 1 minute data, for historical tick trades data, and historical tick level 1 data. All sample data regardless of exchange location is timestamped US Central (GMT -6).
Sample data courtesy of Portara CQG.