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.
PyCharm - Python & Django IDE with intelligent code completion, on-the-fly error checking, quick-fixes, and much more...
quantra - A public API for quantitative finance made with Quantlib
Thonny - Python IDE for beginners
Backtrader - Backtrader is a complete and advanced python framework that is used for backtesting and trading.
Spyder - The Scientific Python Development Environment