onebusaway-gtfs-realtime-from-nextbus-cli 
We provide a utility to convert real-time public transit data from the NextBus API format into the GTFS-realtime format.
For more information on running the tool, check out the latest project documentation:
Official NextBus GTFS-realtime API
Note that NextBus now directly offers a GTFS-realtime API for their products. There may be additional fees associated with enabling this feature. See Cubic site and this FAQ for more information on how to request this API be activated for your system.
Other GTFS-realtime Resources
Be sure to check out all our GTFS-realtime resources.