MetaTrader4-5-plugins

MQL4/MQL5:

https://docs.mql4.com/

https://www.mql5.com/en/docs/

https://www.mql5.com/en/docs/onnx

Python:

https://www.mql5.com/en/docs/python_metatrader5

https://plotly.com/python/financial-charts/

https://dash.plotly.com/

https://github.com/mckinsey/qbstyles

Trading APIs:

Dukascopy (Java):

https://www.dukascopy.com/swiss/english/forex/jforex/

IBKR (multiple languages):

https://www.interactivebrokers.com/campus/ibkr-api-page/getting-started/