This Broker enable web trading, where you can simple login into the platform using Internet Browser. Registered a demo account account here http://fxtrade.oanda.com/trade-forex/demo/

The benefits of the above demo account as follows (which copied from the Oanda Website)

a) Your practice account never expires. You get unlimited free access to the account, for as many or as few times as you want.
b) Trade any time, 24/7. Only OANDA is open for weekend forex trading.
c) Reset your 100,000-unit starting balance or your profit/loss at any time, and change your leverage to test your comfort level.

OANDA fxTrade demo platform
                          Sample Screen layout via Web

Also found out that mobile trading using the same demo account is possible on mobile such as I-Phone / Android … this is awesome !! Yet to try on mobile platform