From Traderpedia

TradeStation is a subscription based software platform that combines charting, technical analysis and order execution in one combined interface.

TradeStation retail brokerage orders are processed by TradeStation Securities Brokerage, who currently clear through RJ O'Brien FCM.

TradeStation provides data for US commodity and index futures, US SSF, US equities and US options. No data is currently provided for European or other markets which greatly limits its use by non US clients.