Does Netreo’s Looking Glass feature support non-Cisco network devices?

Yes.

Any manufacturer with a working SSH or telnet interface is already supported, although there are no prebuilt commands for them.

The Looking Glass Administration page (Administration > Tools > Looking Glass) allows you to add custom commands for any vendor.

If the device type doesn’t appear in the list, simply go to the Polling Administration page (Administration > Change Devices > Edit Pollers), click the edit icon for the device type and make sure “Looking Glass” is set to ON.