trademonster.com offers a free online simulation of their platform as well.
Quote from Bry:
I tried Ninja demo once. The price went up, up, up...then it went up some more, and kept going up. Then it went up, up, and up, and up some more. Then it kept going up, and up, and I thought, "This is a joke, not like real market at all." And it isn't.
Quote from TrendPlayer:
I thought Ninja was free. All you had to pay for was the data feed.
Am I wrong?
(Not including any add-ons)