TD Ameritrade allows foreigners to open accounts for many countries, You can check with them to see if you can.

use your mind really

I live in Australia & need to trade securities worldwide. Which broker can I use to do this? I have passports for Aus, EU, and US if that matters.

I need an online broker with a software platform that allows trading on all or most exchanges, doesnt charge outragous fees or commissions, or requires a large initial deposit.

Any help on this is largely appreciated.

Thankyou.