T.D. Ameritrade's thinkorswim (TOS) platform is not just a good platform; we think it's great. It's one of the most popular trading platforms on the market and allows you to trade stocks, options, penny stocks, and futures. It's good for beginners and advanced traders. Their charts, filter studies, and scanners are top-notch in the industry. They are a solid overall trading broker. The only drawback is they have had some issues with lag lately. Market orders are taking a while. Not pretty if you are day trading and your market order takes a long time to fill.