Hi

I have seen that there is a tool called OFA Order Flow Analytics which analysis the amount of buyers and sellers in each moment. http://www.orderflowanalytics.com/next-generation-trading/
It is integrated with Ninjatrader and I do not know if it could be integrated with zorro.
But I have read that OFA gets the data from another source like esignal. So in this way, zorro could get the data provided by them to perform similar analysis.