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.

Canny - Canny helps you collect and organize feature requests to better understand customer needs and prioritize your roadmap.

quantra - A public API for quantitative finance made with Quantlib

hummingbot - Automate crypto trading with your own market making bot

Backtrader - Backtrader is a complete and advanced python framework that is used for backtesting and trading.

Period Tracker - Period Tracker, the easiest way to track your periods!