George IV - Indicators
George IV uses very simple indicators and only a few. You should be able to find them in most charting programs.
I recommend Sierra Chart. It's not because they pay me for doing so, but simply because that's what I use for my own trading and therefore can help you with as best as I can.
However, templates for NinjaTrader (both 6.5 and 7) and Quotetracker, in addition to those for Sierra Chart, are included in George IV package too and some people do prefer those charting packages over Sierra Chart. In part this is because NinjaTrader is free for charting and analysis and Quotetracker can also be free.
Other charting packages can be used for operating this system as well, so you have a pretty broad selection of software that is suitable for George IV.