I find Quantopian is a pretty good testbed given you can get their stock data for free in their contests. No need for a brokerage account, minimum, or any sort

I find Quantopian is a pretty good testbed given you can get their stock data for free in their contests. No need for a brokerage account, minimum, or any sort of fee. https://www.quantopian.com/open https://www.quantopian.com/open