Quantopian is a very popular platform for quantitative trading.
https://www.quantopian.com/

for those not familiar with Quantopian it is a platform "like kaggle" for algorithm trading.. 
You have access to historical data;
the capability to share your trading strategy on jupyter notebooks (it got all data science, machine learning tools pre-installed);
backtesting (zipline library under the hood);
foretesting (paper trading);
Contests, etc.

I found this one
https://crix.io/

Is there any other you guys may suggest?

Thanks