paper trading

There is a popular paper trading platform that used to be discussed here on ET occasionally. I've tried the search option but couldn't locate it. Its not free and I believe it can be used with a brokerage account but I am not sure about that either. Does anyone know what platform I'm referring to.

Thanks for any replies.
 
I've had two accounts with IB. Nothing but bad service. Don't want to try them again unless I really have to.

Thanks for the reply to all and regards.

In the meantime, I'm still looking.
 
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