OneBusAway <ref>University of Washington. "OneBusAway - Where is your bus?". Accessed August 1, 2012 from http://onebusaway.org/</ref> is an open-source software system for real-time transit information that grew out of research at the University of Washington. The initial OneBusAway deployment was in the Puget Sound area in Washington, although OneBusAway
is in the process of being deployed in several other locations in both production and development deployments <ref>OneBusAway. "OneBusAway Deployments." Accessed August 1, 2012 from https://github.com/OneBusAway/onebusaway/wiki/OneBusAway-Deployments</ref>. MTA in New York is using OneBusAway software as the foundation of their Bus Time system <ref>Metropolitan Transportation Authority. "MTA Bus Time(R)." Accessed August 1, 2012 from http://bustime.mta.info/</ref>.
OneBusAway uses GTFS data for the basic description of the transit system. Real-time information can be injected into the OneBusAway system using a variety of formats <ref>OneBusAway. "Real-Time Configuration Guide." Accessed August 1, 2012 from http://developer.onebusaway.org/modules/onebusaway-application-modules/current/guides/realtime-configuration-guide.html</ref>, including GTFS-realtime, SIRI, and ACS Orbital Orbcad.