GFF provides free top of the book market data depending on your data feed:
Tradovate (CQG) — free market data for all CME Bundle.
DxFeed — free market data for CME instruments only. If you'd like to trade instruments on additional exchanges such as CBOT or NYMEX, reach out to our team and we will add this manually for you.
Note: Gold and Silver are listed under COMEX, not CME, so they are included in the free data when trading via Tradovate.