QuantConnect - QuantConnect provides a free algorithm backtesting tool and financial data so engineers can design algorithmic trading strategies. We are democratizing algorithm trading technology to empower investors.

Coinrule - Coinrule empowers traders to compete with professional algorithmic traders and hedge funds.

quantra - A public API for quantitative finance made with Quantlib

Breaking Equity - Algo trading platform for retail investors

Quantreex - An automated trading platform that you let you create trading strategies intuitively.

Ovulation calendar online - Calculate your periods and find out when you are most likely to get pregnant!