04-02-2016 12:42 AM
I reccomend you to read the datasheets for both products. The explain all features of each application.
Flow Manager is a little app installed within the controller. Similar to topolgy manager it shows the discovered network devices and links. It lets you configure flows, paths and more for each device. It's a configuartion interface.
BFO is totally different. It is a standalone app. It collects sFlow data from your network devices an lets you visualize them based on the individual flows. You can create policies to steer traffic flows in your network with openflow rules. It requires an SDN controller to interact with your devices. It can do much more than this, have a look to the datasheet.