This Finpip overview summarizes TradeStation as commonly marketed to retail traders (founded 1982; HQ: Plantation, USA). Typical platforms include TradeStation desktop and web.
Regulatory snapshot (not legal advice): US NFA/CFTC; FCA; Japanese FSA via subsidiary
Official website: https://www.tradestation.com/. Confirm licence numbers, product availability, and costs there before funding an account.