I am looking for software in which I can develop algorithms,...

I am looking for software in which I can develop algorithms, formulas to predict stock movements. I have a stockscan (free) account and that's exactly what I need. i don't lkke the pricing though for the pro version, it's more a hobby than a job for me, and I would't want to invest any money (as yet). i would like to be able to backtest as well.

Any suggestions?