I'm aware of HitBtc which is a very reputable exchange (no leverage) and there is eToro which I used in the past for other purposes and also Whaleclub but I have no idea how legit it is as I never tried it, you may want to look more about it.
I'm not sure if you read the thread, he's looking for demo trading platforms, not the real exchangers. Hitbtc and etoro are regular and real trading platforms, not the demo trading ones.