The best Forex platform that supports Algos

There are many  Forex platform  to figure out what the best Forex platform that supports Algo it's a wonder to everyone, here are some suggestions for you:
It really depends on what type of algorithm you're running. 

Moderate to low frequency strategies: 

NinjaTrader is superior for backtesting and execution. The fact that it's written in C# is a real advantage. Development of simple strategies is very fast and the platform does a great job of loading cleaned data, assuming you find a source. 

The disadvantage is that the platform is not user friendly. It can take quite awhile to learn where all the moving parts are. I'm a programmer and it still took me a solid week to really learn it. The lack of broker choices is also a serious drawback.

MetaTrader is terrible for backtesting and execution. I happen to use this platform for managing my clients, but only because it was so easy to get up and running. There are 500+ brokers that use MT4, so you won't have any trouble switching brokers when needed. Also, the programming language is so easy that it's worth testing in one platform and then re-translating the code into MQL4. 

You can find a full comparison between the two platforms at Comparison: MetaTrader, NinjaTrader, TradeStation

High frequency or venue dependent: Trading Technologies. This is a platform geared towards professional traders. The API lets you customize everything under the sun, but it also allows you to skip a lot of the programming work with hooking into various exchanges and liquidity providers. It's incredibly fast. 

If you trade strictly forex, then Currenex is also a great option.