California Natural Gas Vehicle Coalition (CNGVC) - Non profit corporation sponsored by dedicated to promoting the use of natural gas vehicles, expanding California's infrastructure of natural gas fueling stations, and increasing the availability of natural gas vehicle to the public.

Clean Car Maps - Alternative vehicle fueling maps. Includes database of fueling locations with driving directions in California.

Clean Energy Fuels Corp - Provider of natural gas for transportation in north America. Includes list of natural gas fueling stations.

Clever - A city vehicle for two people with a width less than one metre and very low fuel consumption (using compressed natural gas), designed by a European consortium and funded by the European Union Commission. Designs, technology, marketing analysis, partners and publications.

Hendrix Industrial Gastrux - Propane and natural gas conversion service, kits, and parts, including carburetors, regulators, auto, forklift and small engines.

Impco Technologies, Inc. - A leading designer, manufacturer, and supplier of advanced fuel storage, fuel delivery, and electronic control systems that allow internal combustion engines and fuel cells to operate using clean fuels such as hydrogen,propane, natural gas, and methanol.