🔎 📈 🐍 💰 Backtest trading strategies in Python.

Free, open source, a high frequency trading and market making backtesting and trading bot, which accounts for limit orders, queue positions, and latencies, utilizing full tick data for trades and order books(Level-2 and Level-3), with real-world crypto trading examples for Binance and Bybit

QuantStart.com - QSTrader backtesting simulation engine.

Open-source Rust framework for building event-driven live-trading & backtesting systems

Backtesting and Trading Bots Made Easy for Crypto, Stocks, Options, Futures, FOREX and more. Lumibot also makes it very easy to run and backtest agentic AI trading strategies in a safer way.

A stock backtesting engine written in Java. And a pairs trading (cointegration) strategy implementation using a bayesian kalman filter model

Option and stock backtester / live trader

SimTradeLab is an open-source backtesting framework inspired by PTrade’s event-driven architecture. It features a lightweight, modular design and full syntax compatibility, enabling seamless strategy development and validation.

A fork of Nautilus Trader with custom Polymarket and Kalshi adapters for backtesting

Quantitative systematic trading strategy development and backtesting in Julia

Hybrid Event-driven and Vectorized Strategy Backtesting Library

PyneCore - Pine Script Like Python Framework

Python based open source quantitative trading platform development framework

Sub-microsecond bare-metal execution engine with deterministic replay, lock-free order path, and hardware-timestamped latency measurement.

High-performance quantitative factor cleaning and backtesting library

Professional Backtesting Engine for crypto, stocks and forex

A Black-Scholes-based options backtesting simulator

backtrader documentation

High performance, low-latency backtesting engine for testing quantitative trading strategies on historical and live data in Rust

AI-powered SDK featuring algorithmic trading, backtesting, deployment on 100+ exchanges, and multiple optimization engines.