There are several reasons why someone might want to use ZeroLine Trader over NinjaTraders built in Trade Management software. You may like Zeroline Trader's trade management software over Ninjatraders ATM software because it is easy to use and you can customize your strategies in Zeroline Trader to your liking. You may also be using Zeroline Trader over NinjaTrader because you don't want to pay to have to use NinjaTrader but you like the charts and strategies that you've designed. Many people will install NinjaTrader and develop an automated trade system but never go live with it because of the extra fee's it costs to use NinjaTraders Trade management software. If you are client of Interactive Brokers there is a simple way around those fees by using another 3rd party application to manage the trade like ZeroLine Trader.
What you can do is setup an automated trade system in NinjaTrader and instead of using NinjaTrader trade management software, you send an email out to ZeroLine Trader to place the trade for you, and then ZeroLine Trader sends the order to Interactive Brokers. Using the Perl script I've written, and with a little bit of coding, this is a very simple setup and gives you a fully functional automated trade system for Ninjatrader through Interactive Brokers without the extra cost of having to own Ninjatrader or pay the extra cost for placing each trade. Having the automated trade system run directly through Ninjatrader to Interactive Brokers will be slightly faster and may be slightly easier to setup; however, using ZeroLine Trader as a middleman to save on the extra fee's may be worth it.
Here are the Downloads you will need-
Charting and Trading Platform