FxConsole?
Because it doesn't render fancy 3D candlesticks with shadows and wicks that glow. It renders numbers. Fast. It is written in C++ or native C#, designed to run on a virtual machine in a dark datacenter next to your broker's matching engine. Traders using FxConsole often run it on Windows Server Core—an OS with no GUI except the console itself. The hidden gem is the internal scripting language. It isn't Python or MQL4. It is a proprietary, terse, Forth-like or C-like scripting engine that allows you to hot-key complex strategies. fxconsole
That is FxConsole.