This Finpip overview summarizes OANDA as commonly marketed to retail traders (founded 1996; HQ: New York, USA / Toronto, Canada). Typical platforms include fxTrade, MetaTrader 4, MetaTrader 5.
Regulatory snapshot (not legal advice): Multiple regulators globally (e.g. US CFTC/NFA, UK FCA, ASIC, MAS); entity varies by region
Official website: https://www.oanda.com/. Confirm licence numbers, product availability, and costs there before funding an account.