Is it possible to run Amazon echo without an openhab.org account?
Use the Hue Emulation add-in. It is in the Misc category, not the Binding category. (The Hue in Bindings talks TO Hue hubs) Using Hue emulation OpenHab will look like a Hue hub to Alexa and you can tag your OpenHab devices to be discoverable and voice-controlled thru Alexa. No openhab.org account involved.