Are you asking if data is collected via means other than stat cast systems? Or if the data is made available through means other than stat cast?
I know batted ball velocity has been around a lot longer than stat cast. Whether that's because stat cast has simply integrated data generated by other means or not, I'm not sure.
There is more advanced statistical info out there, most of it behind (substantial) paywalls through companies like Stats, Inc. That said, I'm not sure minor league batted ball data from any source is all that common or reliable.