Free Online Stock Trading Games

hello, i would like to know if anyone can refer me to games that have to do with trading. Kind of like stocks/ shares/ etc( investing ) in the real world. i play this game called runescape which has this “thing” called grand exchange. i use it as a way to make money. buy low sell high.
i really want to know if there’re other online games that have got to do with trading. i hope i’ve expressed myself clearly. i can’t think of a word to use for such game genres. hope you know what i mean and thanks for your recommendations.
p.s, preferrably games that’re free. i don’t mind downloading applications or software.
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