My broker is WHSelfinvest. This is simply the best I could test.

The software is convenient, fast and reliable. Tools for research, trading and programming best suited to every type of trader. And to top it all, very competitive rates: only 3€ per order, regardless of the amont of your trade.

To receive my advice for free, subscribe WHSelfinvest through me. And in addition to explain my methods of trading, I will bring technical support to use the software.