CME E-quotes Direct real-time price quotes from the Chicago Mercantile Exchange. https://equotes.cme.com/

EnergyView An Internet-based service providing real time and historical data by integrating multiple data feeds. http://www.energyview.com/

CSI - Commodity Systems Inc. Supplier of daily and historical information on commodities stocks, options and mutual funds. http://www.csidata.com/