I don't think that was what he meant.
I think he was talking about just a low starting capital in general, Which i would indeed like to know aswell.
Problem is that these sites have to do with fees aswell, therefore it becomes very unprofitable to trade with low amounts.
It looks plain logic to me that there are no sites which give out free starter capital.
I did not understood the OP's intention, neither. A free starter capital usually hints on a gambling house, to hook in new customers, we are far away from that game of chances, aren't we
The trading fees are proportional on your trade size, so small in absolute proporsitions on a small portfolio. No barrier to enter.