I have provided a list below that attempts to rank different ways to automate trading according to their degree of sophistication. That is, the list is meant to be ordered with the least capable systems at the bottom and the most capable systems at the top. I appreciate that the ordering of the systems on this list may be somewhat open to dispute. It is my intention to open this matter up to discussion, so that we all may learn. Please feel free to post any comments or disagreements. Completely Custom Application Custom Front End to a Broker's API TradeStation linked to another broker (for better commissions, different instruments, etc.) TradeStation WealthLab, TradeBold, TradeBullet, AmiBroker, NinjaTrader, etc.