The National Automotive Center (NAC, part of the U.S. Army Tank Automotive Research, Development and Engineering Center - TARDEC) has worked with the FTA in support of the Georgetown Fuel Cell Bus Program. The NAC is part of the U.S. Army, a branch of the Department of Defense.

DARPA, the agency leading innovation and advanced R&D for the U.S. Department of Defense, co-sponsored development of the Generation II Ballard X-1 PEM Fuel Cell Bus.

The Office of Energy Efficiency and Renewable Energy, a branch of U.S. Department of Energy co-sponsored development of the Generation I Fuel Cell Buses from 1984-1994.

The South Coast Air Quality Management District is an agency responsible for controlling emissions in the heavily populated counties of Southern California. SCAQMD was a co-sponsor of the Generation I Fuel Cell Bus Program.

Ballard built the PEM fuel cell system for the second Generation II 40-foot bus.

Fuji Electric Co., Ltd. manufactured the 50 kW phosphoric acid fuel cells in the three Generation I 30-foot transit buses.

A joint venture owned by DaimlerChrysler and Ford, NuCellSys GmbH designed and manufactured several generations of methanol processors and fuel cell systems. NuCellSys is working with ZSW in integrating and testing the Generation III methanol fuel cell system.

UTC Power provided the 100 kW phosphoric acid fuel cell that powers the first Generation II 40-foot bus.

BAE Systems, which was Lockheed Martin Control Systems prior to being purchased by BAE Systems North America, is the supplier for the power and propulsion systems aboard the Generation II Fuel Cell Buses.

Saminco supplied the power and propulsion systems for the Generation I Fuel Cell Buses.

Booz Allen Hamilton, a technology consulting firm headquartered in the Washington, DC metro area, was the systems integrator and developer of the vehicle system controllers for both the Generation I and II Fuel Cell Buses.

VSI assisted in the systems integration and vehicle systems controller design for the Generation II Fuel Cell Bus Program.

ZSW, the Center for Solar Energy and Hydrogen Research (Zentrum für Sonnenenergie und Wasserstoff-Forschung), is a nonprofit research institute located in the state of Baden-Württemberg, Germany. ZSW has extensive experience with fuel cells and other alternative energy sources, and is integrating and testing the Generation III methanol fuel cell system.

BMI is the manufacturer of the specially-designed 30-foot buses for the Generation I Fuel Cell Bus Program.

Both of the Georgetown University Generation II Fuel Cell Buses were specially designed and modified Nova BUS RTS vehicles.