No single easy source of intraday data. Tick data vendors have expensive historical, Yahoo or Phillip securities for some EoD
For some equities + futures Nextview, Quotepower,
For all Reuters Bridgestation (+ BBG Reut 3000, S&P Comstock)
eSignal covers many but my experiemce was of corrupt data that did not get fixed.
InteractiveBrokers acount gives Futures RT + Backfill for charting packages like TS2000, Sierra, Quotetracker + Ensign.
Quotetracker will accept data from some brokers in the region, but generally an acount is required.