- Abacus GDS
- Alamo Rent A Car
- Amadeus GDS
- Arzoo
- Avis – popular luxury car rental company
- Booking.com
- Car Trawler
- CarHireEngine
- Carrentals.Co.Uk
- ClearTrip
- Dollar – Car Rental API Provider
- Europcar
- Expedia Affiliate Network (EAN)
- Grupo Transhotel
- Hertz
- Hotelbeds
- Hotelscombined – Travel Meta-Search Engine
- Hotwire
- Irish Car Rentals
- Orbitz
- Priceline – Hotel Deal Provider Company
- Sixt – Car Rental Company
- TBO Holidays
- Thrifty – Car Rental Provider
- Travelport GDS