Netbeez is one of those companies that seems to be attacking the monitoring market in a way that others have before. ThousandEyes had a VM that could be deployed anywhere and then provides data back to you via their dashboard. Granted, I don’t know enough about NetBeez yet to be able to say how they compare, or even if they do compare. I believe they are appliance based, with something in a similar form factor to that of a Raspberry Pi.
Here’s a good overview of what NetBeez currently does.